21184252135 has 16 divisors (see below), whose sum is σ = 26125013376. Its totient is φ = 16478719488.

The previous prime is 21184252129. The next prime is 21184252147. The reversal of 21184252135 is 53125248112.

It is a cyclic number.

It is not a de Polignac number, because 21184252135 - 2²⁵ = 21150697703 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21184252135.

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 15 ways as a sum of consecutive naturals, for example, 256687 + ... + 329023.

It is an arithmetic number, because the mean of its divisors is an integer number (1632813336).

Almost surely, 2^21184252135 is an apocalyptic number.

21184252135 is a deficient number, since it is larger than the sum of its proper divisors (4940761241).

21184252135 is a wasteful number, since it uses less digits than its factorization.

21184252135 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 73962.

The product of its digits is 19200, while the sum is 34.

The spelling of 21184252135 in words is "twenty-one billion, one hundred eighty-four million, two hundred fifty-two thousand, one hundred thirty-five".