21713328825 has 48 divisors (see below), whose sum is σ = 38472763776. Its totient is φ = 10777536000.

The previous prime is 21713328817. The next prime is 21713328859. The reversal of 21713328825 is 52882331712.

It is not a de Polignac number, because 21713328825 - 2³ = 21713328817 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, 106276 + ... + 233925.

It is an arithmetic number, because the mean of its divisors is an integer number (801515912).

Almost surely, 2^21713328825 is an apocalyptic number.

21713328825 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21713328825 is a deficient number, since it is larger than the sum of its proper divisors (16759434951).

21713328825 is a wasteful number, since it uses less digits than its factorization.

21713328825 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 340274 (or 340269 counting only the distinct ones).

The product of its digits is 161280, while the sum is 42.

The spelling of 21713328825 in words is "twenty-one billion, seven hundred thirteen million, three hundred twenty-eight thousand, eight hundred twenty-five".