21135874075 has 12 divisors (see below), whose sum is σ = 27587878360. Its totient is φ = 16018767360.

The previous prime is 21135874051. The next prime is 21135874129. The reversal of 21135874075 is 57047853112.

It is not a de Polignac number, because 21135874075 - 2¹⁷ = 21135743003 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 22247814 + ... + 22248763.

Almost surely, 2^21135874075 is an apocalyptic number.

21135874075 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

21135874075 is a deficient number, since it is larger than the sum of its proper divisors (6452004285).

21135874075 is a wasteful number, since it uses less digits than its factorization.

21135874075 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44496606 (or 44496601 counting only the distinct ones).

The product of its (nonzero) digits is 235200, while the sum is 43.

The spelling of 21135874075 in words is "twenty-one billion, one hundred thirty-five million, eight hundred seventy-four thousand, seventy-five".