21721063096319 has 4 divisors (see below), whose sum is σ = 22077146097960. Its totient is φ = 21364980094680.

The previous prime is 21721063096279. The next prime is 21721063096331. The reversal of 21721063096319 is 91369036012712.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21721063096319 - 2²⁸ = 21720794660863 is a prime.

It is a super-2 number, since 2×21721063096319² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21721063096339) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (31) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 178041500729 + ... + 178041500850.

It is an arithmetic number, because the mean of its divisors is an integer number (5519286524490).

Almost surely, 2^{21721063096319} is an apocalyptic number.

21721063096319 is a deficient number, since it is larger than the sum of its proper divisors (356083001641).

21721063096319 is an equidigital number, since it uses as much as digits as its factorization.

21721063096319 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 356083001640.

The product of its (nonzero) digits is 734832, while the sum is 50.

The spelling of 21721063096319 in words is "twenty-one trillion, seven hundred twenty-one billion, sixty-three million, ninety-six thousand, three hundred nineteen".