| Base | Representation |
|---|---|
| bin | 10011101010111010… |
| … | …101011111011010000 |
| 3 | 2000111222010011111210 |
| 4 | 103222322223323100 |
| 5 | 321224001401000 |
| 6 | 13411454540120 |
| 7 | 1345254401106 |
| oct | 235272537320 |
| 9 | 60458104453 |
| 10 | 21121122000 |
| 11 | 8a59360630 |
| 12 | 4115507640 |
| 13 | 1cb7a42634 |
| 14 | 1045161c76 |
| 15 | 8393c5350 |
| hex | 4eaeabed0 |
21121122000 has 320 divisors, whose sum is σ = 78199280640. Its totient is φ = 4850496000.
The previous prime is 21121121993. The next prime is 21121122007. The reversal of 21121122000 is 22112112.
It is an interprime number because it is at equal distance from previous prime (21121121993) and next prime (21121122007).
It is a super-2 number, since 2×211211220002 (a number of 21 digits) contains 22 as substring.
It is a Harshad number since it is a multiple of its sum of digits (12).
It is a congruent number.
It is not an unprimeable number, because it can be changed into a prime (21121122007) by changing a digit.
It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 1245579 + ... + 1262421.
It is an arithmetic number, because the mean of its divisors is an integer number (244372752).
Almost surely, 221121122000 is an apocalyptic number.
21121122000 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 21121122000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (39099640320).
21121122000 is an abundant number, since it is smaller than the sum of its proper divisors (57078158640).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
21121122000 is a wasteful number, since it uses less digits than its factorization.
21121122000 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 16899 (or 16883 counting only the distinct ones).
The product of its (nonzero) digits is 16, while the sum is 12.
Adding to 21121122000 its reverse (22112112), we get a palindrome (21143234112).
It can be divided in two parts, 2112112 and 2000, that added together give a palindrome (2114112).
The spelling of 21121122000 in words is "twenty-one billion, one hundred twenty-one million, one hundred twenty-two thousand".
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