21616875179 has 2 divisors, whose sum is σ = 21616875180. Its totient is φ = 21616875178.

The previous prime is 21616875169. The next prime is 21616875199. The reversal of 21616875179 is 97157861612.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21616875179 - 2²⁴ = 21600097963 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21616875179.

It is not a weakly prime, because it can be changed into another prime (21616875139) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10808437589 + 10808437590.

It is an arithmetic number, because the mean of its divisors is an integer number (10808437590).

Almost surely, 2^21616875179 is an apocalyptic number.

21616875179 is a deficient number, since it is larger than the sum of its proper divisors (1).

21616875179 is an equidigital number, since it uses as much as digits as its factorization.

21616875179 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1270080, while the sum is 53.

The spelling of 21616875179 in words is "twenty-one billion, six hundred sixteen million, eight hundred seventy-five thousand, one hundred seventy-nine".