21271033264 has 20 divisors (see below), whose sum is σ = 44382829456. Its totient is φ = 9817399872.

The previous prime is 21271033229. The next prime is 21271033271. The reversal of 21271033264 is 46233017212.

It is a happy number.

It is a super-2 number, since 2×21271033264² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 51132084 + ... + 51132499.

Almost surely, 2^21271033264 is an apocalyptic number.

It is an amenable number.

21271033264 is an abundant number, since it is smaller than the sum of its proper divisors (23111796192).

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

21271033264 is a wasteful number, since it uses less digits than its factorization.

21271033264 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 102264604 (or 102264598 counting only the distinct ones).

The product of its (nonzero) digits is 12096, while the sum is 31.

The spelling of 21271033264 in words is "twenty-one billion, two hundred seventy-one million, thirty-three thousand, two hundred sixty-four".