22497572921 has 2 divisors, whose sum is σ = 22497572922. Its totient is φ = 22497572920.

The previous prime is 22497572879. The next prime is 22497572939. The reversal of 22497572921 is 12927579422.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 21620761600 + 876811321 = 147040^2 + 29611^2 .

It is a cyclic number.

It is not a de Polignac number, because 22497572921 - 2⁶ = 22497572857 is a prime.

It is a super-2 number, since 2×22497572921² (a number of 22 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 22497572921.

It is not a weakly prime, because it can be changed into another prime (22497572821) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11248786460 + 11248786461.

It is an arithmetic number, because the mean of its divisors is an integer number (11248786461).

Almost surely, 2^22497572921 is an apocalyptic number.

It is an amenable number.

22497572921 is a deficient number, since it is larger than the sum of its proper divisors (1).

22497572921 is an equidigital number, since it uses as much as digits as its factorization.

22497572921 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1270080, while the sum is 50.

The spelling of 22497572921 in words is "twenty-two billion, four hundred ninety-seven million, five hundred seventy-two thousand, nine hundred twenty-one".