21472225731 has 24 divisors (see below), whose sum is σ = 34114669680. Its totient is φ = 13013462880.

The previous prime is 21472225703. The next prime is 21472225769. The reversal of 21472225731 is 13752227412.

21472225731 is a `hidden beast` number, since 2 + 14 + 72 + 2 + 2 + 573 + 1 = 666.

It is not a de Polignac number, because 21472225731 - 2⁵ = 21472225699 is a prime.

It is a super-2 number, since 2×21472225731² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21472225231) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 884266 + ... + 908223.

It is an arithmetic number, because the mean of its divisors is an integer number (1421444570).

Almost surely, 2^21472225731 is an apocalyptic number.

21472225731 is a deficient number, since it is larger than the sum of its proper divisors (12642443949).

21472225731 is a wasteful number, since it uses less digits than its factorization.

21472225731 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1792528 (or 1792503 counting only the distinct ones).

The product of its digits is 47040, while the sum is 36.

The spelling of 21472225731 in words is "twenty-one billion, four hundred seventy-two million, two hundred twenty-five thousand, seven hundred thirty-one".