21524694825 has 48 divisors (see below), whose sum is σ = 37792313280. Its totient is φ = 10779310080.

The previous prime is 21524694817. The next prime is 21524694847. The reversal of 21524694825 is 52849642512.

It is not a de Polignac number, because 21524694825 - 2³ = 21524694817 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 94189 + ... + 227861.

It is an arithmetic number, because the mean of its divisors is an integer number (787339860).

Almost surely, 2^21524694825 is an apocalyptic number.

21524694825 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21524694825 is a deficient number, since it is larger than the sum of its proper divisors (16267618455).

21524694825 is a wasteful number, since it uses less digits than its factorization.

21524694825 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 133818 (or 133813 counting only the distinct ones).

The product of its digits is 1382400, while the sum is 48.

The spelling of 21524694825 in words is "twenty-one billion, five hundred twenty-four million, six hundred ninety-four thousand, eight hundred twenty-five".