| Base | Representation |
|---|---|
| bin | 1001101001010110101010… |
| … | …00000100011011111000000 |
| 3 | 2210002212012021020011212120 |
| 4 | 10310223111000203133000 |
| 5 | 10240014411240400000 |
| 6 | 113040414151324240 |
| 7 | 4316345106514614 |
| oct | 464532500433700 |
| 9 | 83085167204776 |
| 10 | 21212122200000 |
| 11 | 6839012a8a436 |
| 12 | 2467074980680 |
| 13 | bab3aa14a644 |
| 14 | 53495a6d3344 |
| 15 | 26bb98dce6a0 |
| hex | 134ad50237c0 |
21212122200000 has 336 divisors, whose sum is σ = 72046211434848. Its totient is φ = 5503680000000.
The previous prime is 21212122199999. The next prime is 21212122200001. The reversal of 21212122200000 is 222121212.
It is an interprime number because it is at equal distance from previous prime (21212122199999) and next prime (21212122200001).
It is a Harshad number since it is a multiple of its sum of digits (15).
It is a congruent number.
It is not an unprimeable number, because it can be changed into a prime (21212122200001) by changing a digit.
It is a pernicious number, because its binary representation contains a prime number (19) of ones.
It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 21722250 + ... + 22677750.
It is an arithmetic number, because the mean of its divisors is an integer number (214423248318).
Almost surely, 221212122200000 is an apocalyptic number.
21212122200000 is a gapful number since it is divisible by the number (20) formed by its first and last digit.
It is an amenable number.
It is a practical number, because each smaller number is the sum of distinct divisors of 21212122200000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (36023105717424).
21212122200000 is an abundant number, since it is smaller than the sum of its proper divisors (50834089234848).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
21212122200000 is an frugal number, since it uses more digits than its factorization.
21212122200000 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 955578 (or 955548 counting only the distinct ones).
The product of its (nonzero) digits is 64, while the sum is 15.
Adding to 21212122200000 its reverse (222121212), we get a palindrome (21212344321212).
The spelling of 21212122200000 in words is "twenty-one trillion, two hundred twelve billion, one hundred twenty-two million, two hundred thousand".
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