21885920118149 has 2 divisors, whose sum is σ = 21885920118150. Its totient is φ = 21885920118148.

The previous prime is 21885920118133. The next prime is 21885920118157. The reversal of 21885920118149 is 94181102958812.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16668725080225 + 5217195037924 = 4082735^2 + 2284118^2 .

It is a cyclic number.

It is not a de Polignac number, because 21885920118149 - 2⁴ = 21885920118133 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21885920118169) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10942960059074 + 10942960059075.

It is an arithmetic number, because the mean of its divisors is an integer number (10942960059075).

Almost surely, 2^{21885920118149} is an apocalyptic number.

It is an amenable number.

21885920118149 is a deficient number, since it is larger than the sum of its proper divisors (1).

21885920118149 is an equidigital number, since it uses as much as digits as its factorization.

21885920118149 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3317760, while the sum is 59.

The spelling of 21885920118149 in words is "twenty-one trillion, eight hundred eighty-five billion, nine hundred twenty million, one hundred eighteen thousand, one hundred forty-nine".