22121022120021 has 24 divisors (see below), whose sum is σ = 34863684935040. Its totient is φ = 13404250555200.

The previous prime is 22121022120013. The next prime is 22121022120023. The reversal of 22121022120021 is 12002122012122.

It is a happy number.

22121022120021 is a `hidden beast` number, since 2 + 212 + 10 + 221 + 200 + 21 = 666.

It is not a de Polignac number, because 22121022120021 - 2³ = 22121022120013 is a prime.

It is a super-3 number, since 3×22121022120021³ (a number of 41 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 22121022119976 and 22121022120003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22121022120023) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 19696840 + ... + 20789601.

It is an arithmetic number, because the mean of its divisors is an integer number (1452653538960).

Almost surely, 2^{22121022120021} is an apocalyptic number.

It is an amenable number.

22121022120021 is a deficient number, since it is larger than the sum of its proper divisors (12742662815019).

22121022120021 is a wasteful number, since it uses less digits than its factorization.

22121022120021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40491977 (or 40491974 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

Adding to 22121022120021 its reverse (12002122012122), we get a palindrome (34123144132143).

The spelling of 22121022120021 in words is "twenty-two trillion, one hundred twenty-one billion, twenty-two million, one hundred twenty thousand, twenty-one".