21232120111321 has 32 divisors (see below), whose sum is σ = 26773883136000. Its totient is φ = 16429427925120.

The previous prime is 21232120111313. The next prime is 21232120111327. The reversal of 21232120111321 is 12311102123212.

It is a happy number.

It is not a de Polignac number, because 21232120111321 - 2³ = 21232120111313 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21232120111292 and 21232120111301.

It is not an unprimeable number, because it can be changed into a prime (21232120111327) 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, 45040621 + ... + 45509578.

It is an arithmetic number, because the mean of its divisors is an integer number (836683848000).

Almost surely, 2^{21232120111321} is an apocalyptic number.

It is an amenable number.

21232120111321 is a deficient number, since it is larger than the sum of its proper divisors (5541763024679).

21232120111321 is a wasteful number, since it uses less digits than its factorization.

21232120111321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 90550309.

The product of its (nonzero) digits is 288, while the sum is 22.

Adding to 21232120111321 its reverse (12311102123212), we get a palindrome (33543222234533).

The spelling of 21232120111321 in words is "twenty-one trillion, two hundred thirty-two billion, one hundred twenty million, one hundred eleven thousand, three hundred twenty-one".