21374374625 has 8 divisors (see below), whose sum is σ = 26675219688. Its totient is φ = 17099499600.

The previous prime is 21374374613. The next prime is 21374374631. The reversal of 21374374625 is 52647347312.

It can be written as a sum of positive squares in 4 ways, for example, as 3166650529 + 18207724096 = 56273^2 + 134936^2 .

It is not a de Polignac number, because 21374374625 - 2⁶ = 21374374561 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 85497374 + ... + 85497623.

It is an arithmetic number, because the mean of its divisors is an integer number (3334402461).

Almost surely, 2^21374374625 is an apocalyptic number.

21374374625 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21374374625 is a deficient number, since it is larger than the sum of its proper divisors (5300845063).

21374374625 is an equidigital number, since it uses as much as digits as its factorization.

21374374625 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 170995012 (or 170995002 counting only the distinct ones).

The product of its digits is 846720, while the sum is 44.

The spelling of 21374374625 in words is "twenty-one billion, three hundred seventy-four million, three hundred seventy-four thousand, six hundred twenty-five".