21392182975 has 6 divisors (see below), whose sum is σ = 26526306920. Its totient is φ = 17113746360.

The previous prime is 21392182969. The next prime is 21392182979. The reversal of 21392182975 is 57928129312.

It is not a de Polignac number, because 21392182975 - 2¹⁷ = 21392051903 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21392182979) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 427843635 + ... + 427843684.

Almost surely, 2^21392182975 is an apocalyptic number.

21392182975 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

21392182975 is a deficient number, since it is larger than the sum of its proper divisors (5134123945).

21392182975 is an equidigital number, since it uses as much as digits as its factorization.

21392182975 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 855687329 (or 855687324 counting only the distinct ones).

The product of its digits is 544320, while the sum is 49.

The spelling of 21392182975 in words is "twenty-one billion, three hundred ninety-two million, one hundred eighty-two thousand, nine hundred seventy-five".