21885920118613 has 2 divisors, whose sum is σ = 21885920118614. Its totient is φ = 21885920118612.

The previous prime is 21885920118607. The next prime is 21885920118631. The reversal of 21885920118613 is 31681102958812.

Together with next prime (21885920118631) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20238103747684 + 1647816370929 = 4498678^2 + 1283673^2 .

It is a cyclic number.

It is not a de Polignac number, because 21885920118613 - 2²⁵ = 21885886564181 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21885920518613) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10942960059306 + 10942960059307.

It is an arithmetic number, because the mean of its divisors is an integer number (10942960059307).

Almost surely, 2^{21885920118613} is an apocalyptic number.

It is an amenable number.

21885920118613 is a deficient number, since it is larger than the sum of its proper divisors (1).

21885920118613 is an equidigital number, since it uses as much as digits as its factorization.

21885920118613 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1658880, while the sum is 55.

The spelling of 21885920118613 in words is "twenty-one trillion, eight hundred eighty-five billion, nine hundred twenty million, one hundred eighteen thousand, six hundred thirteen".