21263616232 has 16 divisors (see below), whose sum is σ = 40235055300. Its totient is φ = 10534268160.

The previous prime is 21263616163. The next prime is 21263616233. The reversal of 21263616232 is 23261636212.

It can be written as a sum of positive squares in 2 ways, for example, as 21125459716 + 138156516 = 145346^2 + 11754^2 .

It is not an unprimeable number, because it can be changed into a prime (21263616233) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12191569 + ... + 12193312.

Almost surely, 2^21263616232 is an apocalyptic number.

It is an amenable number.

21263616232 is a deficient number, since it is larger than the sum of its proper divisors (18971439068).

21263616232 is a wasteful number, since it uses less digits than its factorization.

21263616232 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24384996 (or 24384992 counting only the distinct ones).

The product of its digits is 31104, while the sum is 34.

The spelling of 21263616232 in words is "twenty-one billion, two hundred sixty-three million, six hundred sixteen thousand, two hundred thirty-two".