21232120111232 has 64 divisors (see below), whose sum is σ = 42547221299160. Its totient is φ = 10553614417920.

The previous prime is 21232120111187. The next prime is 21232120111291. The reversal of 21232120111232 is 23211102123212.

It can be written as a sum of positive squares in 4 ways, for example, as 21229756595776 + 2363515456 = 4607576^2 + 48616^2 .

It is a tau number, because it is divible by the number of its divisors (64).

It is a junction number, because it is equal to n+sod(n) for n = 21232120111198 and 21232120111207.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 243385382 + ... + 243472602.

Almost surely, 2^{21232120111232} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21232120111232, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21273610649580).

21232120111232 is an abundant number, since it is smaller than the sum of its proper divisors (21315101187928).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21232120111232 is a wasteful number, since it uses less digits than its factorization.

21232120111232 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 98401 (or 98389 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 23.

Adding to 21232120111232 its reverse (23211102123212), we get a palindrome (44443222234444).

The spelling of 21232120111232 in words is "twenty-one trillion, two hundred thirty-two billion, one hundred twenty million, one hundred eleven thousand, two hundred thirty-two".