21311401232 has 20 divisors (see below), whose sum is σ = 45044552976. Its totient is φ = 9687000480.

The previous prime is 21311401217. The next prime is 21311401253. The reversal of 21311401232 is 23210411312.

It is a super-2 number, since 2×21311401232² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 60543578 + ... + 60543929.

Almost surely, 2^21311401232 is an apocalyptic number.

21311401232 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

21311401232 is an abundant number, since it is smaller than the sum of its proper divisors (23733151744).

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

21311401232 is a wasteful number, since it uses less digits than its factorization.

21311401232 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 121087526 (or 121087520 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 20.

Adding to 21311401232 its reverse (23210411312), we get a palindrome (44521812544).

The spelling of 21311401232 in words is "twenty-one billion, three hundred eleven million, four hundred one thousand, two hundred thirty-two".