22169364671981 has 2 divisors, whose sum is σ = 22169364671982. Its totient is φ = 22169364671980.

The previous prime is 22169364671941. The next prime is 22169364672017. The reversal of 22169364671981 is 18917646396122.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11103163643881 + 11066201028100 = 3332141^2 + 3326590^2 .

It is a cyclic number.

It is not a de Polignac number, because 22169364671981 - 2²⁶ = 22169297563117 is a prime.

It is a super-2 number, since 2×22169364671981² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (22169364671941) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11084682335990 + 11084682335991.

It is an arithmetic number, because the mean of its divisors is an integer number (11084682335991).

Almost surely, 2^{22169364671981} is an apocalyptic number.

It is an amenable number.

22169364671981 is a deficient number, since it is larger than the sum of its proper divisors (1).

22169364671981 is an equidigital number, since it uses as much as digits as its factorization.

22169364671981 is an evil number, because the sum of its binary digits is even.

The product of its digits is 47029248, while the sum is 65.

The spelling of 22169364671981 in words is "twenty-two trillion, one hundred sixty-nine billion, three hundred sixty-four million, six hundred seventy-one thousand, nine hundred eighty-one".