21311113232 has 40 divisors (see below), whose sum is σ = 44435863512. Its totient is φ = 9864345600.

The previous prime is 21311113183. The next prime is 21311113259. The reversal of 21311113232 is 23231111312.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 1378191376 + 19932921856 = 37124^2 + 141184^2 .

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, 625619 + ... + 658802.

Almost surely, 2^21311113232 is an apocalyptic number.

It is an amenable number.

21311113232 is an abundant number, since it is smaller than the sum of its proper divisors (23124750280).

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

21311113232 is a wasteful number, since it uses less digits than its factorization.

21311113232 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1284507 (or 1284501 counting only the distinct ones).

The product of its digits is 216, while the sum is 20.

Adding to 21311113232 its reverse (23231111312), we get a palindrome (44542224544).

The spelling of 21311113232 in words is "twenty-one billion, three hundred eleven million, one hundred thirteen thousand, two hundred thirty-two".