21131632575 has 18 divisors (see below), whose sum is σ = 37849102304. Its totient is φ = 11270203920.

The previous prime is 21131632573. The next prime is 21131632633. The reversal of 21131632575 is 57523613112.

21131632575 is a `hidden beast` number, since 2 + 1 + 13 + 1 + 632 + 5 + 7 + 5 = 666.

It is not a de Polignac number, because 21131632575 - 2¹ = 21131632573 is a prime.

It is a super-2 number, since 2×21131632575² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21131632573) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 46958959 + ... + 46959408.

Almost surely, 2^21131632575 is an apocalyptic number.

21131632575 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

21131632575 is a deficient number, since it is larger than the sum of its proper divisors (16717469729).

21131632575 is a wasteful number, since it uses less digits than its factorization.

21131632575 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 93918383 (or 93918375 counting only the distinct ones).

The product of its digits is 37800, while the sum is 36.

The spelling of 21131632575 in words is "twenty-one billion, one hundred thirty-one million, six hundred thirty-two thousand, five hundred seventy-five".