21121222010121 has 48 divisors (see below), whose sum is σ = 32243938272000. Its totient is φ = 13301057462784.

The previous prime is 21121222010113. The next prime is 21121222010131. The reversal of 21121222010121 is 12101022212112.

21121222010121 is a `hidden beast` number, since 211 + 212 + 220 + 1 + 0 + 1 + 21 = 666.

It is not a de Polignac number, because 21121222010121 - 2³ = 21121222010113 is a prime.

It is a super-2 number, since 2×21121222010121² (a number of 27 digits) contains 22 as substring.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 21121222010094 and 21121222010103.

It is not an unprimeable number, because it can be changed into a prime (21121222010131) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 32789665 + ... + 33427601.

It is an arithmetic number, because the mean of its divisors is an integer number (671748714000).

Almost surely, 2^{21121222010121} is an apocalyptic number.

It is an amenable number.

21121222010121 is a deficient number, since it is larger than the sum of its proper divisors (11122716261879).

21121222010121 is a wasteful number, since it uses less digits than its factorization.

21121222010121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 640718 (or 640715 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 18.

Adding to 21121222010121 its reverse (12101022212112), we get a palindrome (33222244222233).

The spelling of 21121222010121 in words is "twenty-one trillion, one hundred twenty-one billion, two hundred twenty-two million, ten thousand, one hundred twenty-one".