21723716370361 has 6 divisors (see below), whose sum is σ = 22709291404730. Its totient is φ = 20779206962448.

The previous prime is 21723716370311. The next prime is 21723716370457. The reversal of 21723716370361 is 16307361732712.

It can be written as a sum of positive squares in only one way, i.e., 19744967747961 + 1978748622400 = 4443531^2 + 1406680^2 .

It is not a de Polignac number, because 21723716370361 - 2²⁵ = 21723682815929 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21723716370311) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 20532812676 + ... + 20532813733.

Almost surely, 2^{21723716370361} is an apocalyptic number.

It is an amenable number.

21723716370361 is a deficient number, since it is larger than the sum of its proper divisors (985575034369).

21723716370361 is an equidigital number, since it uses as much as digits as its factorization.

21723716370361 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41065626455 (or 41065626432 counting only the distinct ones).

The product of its (nonzero) digits is 1333584, while the sum is 49.

The spelling of 21723716370361 in words is "twenty-one trillion, seven hundred twenty-three billion, seven hundred sixteen million, three hundred seventy thousand, three hundred sixty-one".