21465306543179 has 2 divisors, whose sum is σ = 21465306543180. Its totient is φ = 21465306543178.

The previous prime is 21465306543119. The next prime is 21465306543223. The reversal of 21465306543179 is 97134560356412.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21465306543179 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (21465306543119) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10732653271589 + 10732653271590.

It is an arithmetic number, because the mean of its divisors is an integer number (10732653271590).

Almost surely, 2^{21465306543179} is an apocalyptic number.

21465306543179 is a deficient number, since it is larger than the sum of its proper divisors (1).

21465306543179 is an equidigital number, since it uses as much as digits as its factorization.

21465306543179 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 16329600, while the sum is 56.

The spelling of 21465306543179 in words is "twenty-one trillion, four hundred sixty-five billion, three hundred six million, five hundred forty-three thousand, one hundred seventy-nine".