21135394075 has 12 divisors (see below), whose sum is σ = 27749529720. Its totient is φ = 15913708160.

The previous prime is 21135394069. The next prime is 21135394087. The reversal of 21135394075 is 57049353112.

It is not a de Polignac number, because 21135394075 - 2¹¹ = 21135392027 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 24864745 + ... + 24865594.

It is an arithmetic number, because the mean of its divisors is an integer number (2312460810).

Almost surely, 2^21135394075 is an apocalyptic number.

21135394075 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

21135394075 is a deficient number, since it is larger than the sum of its proper divisors (6614135645).

21135394075 is a wasteful number, since it uses less digits than its factorization.

21135394075 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49730366 (or 49730361 counting only the distinct ones).

The product of its (nonzero) digits is 113400, while the sum is 40.

The spelling of 21135394075 in words is "twenty-one billion, one hundred thirty-five million, three hundred ninety-four thousand, seventy-five".