21132429975 has 36 divisors (see below), whose sum is σ = 37859602872. Its totient is φ = 11267928000.

The previous prime is 21132429973. The next prime is 21132429979. The reversal of 21132429975 is 57992423112.

21132429975 is a `hidden beast` number, since 2 + 1 + 132 + 429 + 97 + 5 = 666.

It is not a de Polignac number, because 21132429975 - 2¹ = 21132429973 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 21132429975.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21132429973) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 1235985 + ... + 1252965.

Almost surely, 2^21132429975 is an apocalyptic number.

21132429975 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

21132429975 is a deficient number, since it is larger than the sum of its proper divisors (16727172897).

21132429975 is a wasteful number, since it uses less digits than its factorization.

21132429975 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22528 (or 22520 counting only the distinct ones).

The product of its digits is 272160, while the sum is 45.

The spelling of 21132429975 in words is "twenty-one billion, one hundred thirty-two million, four hundred twenty-nine thousand, nine hundred seventy-five".