| Base | Representation |
|---|---|
| bin | 1100010110001101011… |
| … | …0000010111110000100 |
| 3 | 202021112000102122011221 |
| 4 | 3011203112002332010 |
| 5 | 11433410222334340 |
| 6 | 241240250210124 |
| 7 | 21216351165250 |
| oct | 3054326027604 |
| 9 | 667460378157 |
| 10 | 212120121220 |
| 11 | 81a61307707 |
| 12 | 3513a723944 |
| 13 | 17006320b37 |
| 14 | a3a3a4b260 |
| 15 | 57b752144a |
| hex | 3163582f84 |
212120121220 has 96 divisors (see below), whose sum is σ = 515039616000. Its totient is φ = 71879270400.
The previous prime is 212120121217. The next prime is 212120121223. The reversal of 212120121220 is 22121021212.
It is a happy number.
It is an interprime number because it is at equal distance from previous prime (212120121217) and next prime (212120121223).
It is a junction number, because it is equal to n+sod(n) for n = 212120121194 and 212120121203.
It is not an unprimeable number, because it can be changed into a prime (212120121223) by changing a digit.
It is a pernicious number, because its binary representation contains a prime number (17) of ones.
It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 8145781 + ... + 8171779.
It is an arithmetic number, because the mean of its divisors is an integer number (5364996000).
Almost surely, 2212120121220 is an apocalyptic number.
212120121220 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 212120121220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (257519808000).
212120121220 is an abundant number, since it is smaller than the sum of its proper divisors (302919494780).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
212120121220 is a wasteful number, since it uses less digits than its factorization.
212120121220 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 26693 (or 26691 counting only the distinct ones).
The product of its (nonzero) digits is 64, while the sum is 16.
Adding to 212120121220 its reverse (22121021212), we get a palindrome (234241142432).
The spelling of 212120121220 in words is "two hundred twelve billion, one hundred twenty million, one hundred twenty-one thousand, two hundred twenty".
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