21683991325 has 12 divisors (see below), whose sum is σ = 26960247028. Its totient is φ = 17300678400.

The previous prime is 21683991311. The next prime is 21683991341. The reversal of 21683991325 is 52319938612.

It can be written as a sum of positive squares in 6 ways, for example, as 2672269636 + 19011721689 = 51694^2 + 137883^2 .

It is a de Polignac number, because none of the positive numbers 2^k-21683991325 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1153356 + ... + 1172005.

Almost surely, 2^21683991325 is an apocalyptic number.

21683991325 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21683991325 is a deficient number, since it is larger than the sum of its proper divisors (5276255703).

21683991325 is a wasteful number, since it uses less digits than its factorization.

21683991325 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2325744 (or 2325739 counting only the distinct ones).

The product of its digits is 699840, while the sum is 49.

The spelling of 21683991325 in words is "twenty-one billion, six hundred eighty-three million, nine hundred ninety-one thousand, three hundred twenty-five".