21254472832 has 32 divisors (see below), whose sum is σ = 42478255980. Its totient is φ = 10593263616.

The previous prime is 21254472829. The next prime is 21254472851. The reversal of 21254472832 is 23827445212.

It can be written as a sum of positive squares in 2 ways, for example, as 21252974656 + 1498176 = 145784^2 + 1224^2 .

It is a tau number, because it is divible by the number of its divisors (32).

It is a super-2 number, since 2×21254472832² (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, 225193 + ... + 305320.

Almost surely, 2^21254472832 is an apocalyptic number.

It is an amenable number.

21254472832 is a deficient number, since it is larger than the sum of its proper divisors (21223783148).

21254472832 is an equidigital number, since it uses as much as digits as its factorization.

21254472832 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 530840 (or 530828 counting only the distinct ones).

The product of its digits is 215040, while the sum is 40.

The spelling of 21254472832 in words is "twenty-one billion, two hundred fifty-four million, four hundred seventy-two thousand, eight hundred thirty-two".