21175075015 has 16 divisors (see below), whose sum is σ = 26007654816. Its totient is φ = 16541884800.

The previous prime is 21175074941. The next prime is 21175075039. The reversal of 21175075015 is 51057057112.

It is not a de Polignac number, because 21175075015 - 2¹¹ = 21175072967 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1034985 + ... + 1055245.

It is an arithmetic number, because the mean of its divisors is an integer number (1625478426).

Almost surely, 2^21175075015 is an apocalyptic number.

21175075015 is a deficient number, since it is larger than the sum of its proper divisors (4832579801).

21175075015 is a wasteful number, since it uses less digits than its factorization.

21175075015 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25170.

The product of its (nonzero) digits is 12250, while the sum is 34.

The spelling of 21175075015 in words is "twenty-one billion, one hundred seventy-five million, seventy-five thousand, fifteen".