21223113323121 has 72 divisors (see below), whose sum is σ = 32247132992256. Its totient is φ = 13448923076160.

The previous prime is 21223113323117. The next prime is 21223113323173. The reversal of 21223113323121 is 12132331132212.

21223113323121 is a `hidden beast` number, since 2 + 1 + 2 + 2 + 3 + 11 + 332 + 312 + 1 = 666.

It is not a de Polignac number, because 21223113323121 - 2² = 21223113323117 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21223113323521) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 1277953600 + ... + 1277970206.

Almost surely, 2^{21223113323121} is an apocalyptic number.

It is an amenable number.

21223113323121 is a deficient number, since it is larger than the sum of its proper divisors (11024019669135).

21223113323121 is a wasteful number, since it uses less digits than its factorization.

21223113323121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18323 (or 18297 counting only the distinct ones).

The product of its digits is 2592, while the sum is 27.

Adding to 21223113323121 its reverse (12132331132212), we get a palindrome (33355444455333).

The spelling of 21223113323121 in words is "twenty-one trillion, two hundred twenty-three billion, one hundred thirteen million, three hundred twenty-three thousand, one hundred twenty-one".