21121122012321 has 32 divisors (see below), whose sum is σ = 29225699712000. Its totient is φ = 13551764466240.

The previous prime is 21121122012299. The next prime is 21121122012433. The reversal of 21121122012321 is 12321022112112.

It is not a de Polignac number, because 21121122012321 - 2³⁵ = 21086762273953 is a prime.

It is a super-2 number, since 2×21121122012321² (a number of 27 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21121122011321) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 172922530 + ... + 173044628.

It is an arithmetic number, because the mean of its divisors is an integer number (913303116000).

Almost surely, 2^{21121122012321} is an apocalyptic number.

It is an amenable number.

21121122012321 is a deficient number, since it is larger than the sum of its proper divisors (8104577699679).

21121122012321 is a wasteful number, since it uses less digits than its factorization.

21121122012321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 128469.

The product of its (nonzero) digits is 192, while the sum is 21.

Adding to 21121122012321 its reverse (12321022112112), we get a palindrome (33442144124433).

The spelling of 21121122012321 in words is "twenty-one trillion, one hundred twenty-one billion, one hundred twenty-two million, twelve thousand, three hundred twenty-one".