21515162101579 has 16 divisors (see below), whose sum is σ = 21684676215040. Its totient is φ = 21346014434400.

The previous prime is 21515162101567. The next prime is 21515162101603. The reversal of 21515162101579 is 97510126151512.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21515162101579 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21515162101549) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 711018352 + ... + 711048610.

It is an arithmetic number, because the mean of its divisors is an integer number (1355292263440).

Almost surely, 2^{21515162101579} is an apocalyptic number.

21515162101579 is a deficient number, since it is larger than the sum of its proper divisors (169514113461).

21515162101579 is a wasteful number, since it uses less digits than its factorization.

21515162101579 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36130.

The product of its (nonzero) digits is 189000, while the sum is 46.

The spelling of 21515162101579 in words is "twenty-one trillion, five hundred fifteen billion, one hundred sixty-two million, one hundred one thousand, five hundred seventy-nine".