22421252921 has 2 divisors, whose sum is σ = 22421252922. Its totient is φ = 22421252920.

The previous prime is 22421252873. The next prime is 22421252957. The reversal of 22421252921 is 12925212422.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 22301240896 + 120012025 = 149336^2 + 10955^2 .

It is a cyclic number.

It is not a de Polignac number, because 22421252921 - 2³⁴ = 5241383737 is a prime.

It is not a weakly prime, because it can be changed into another prime (22421252981) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11210626460 + 11210626461.

It is an arithmetic number, because the mean of its divisors is an integer number (11210626461).

Almost surely, 2^22421252921 is an apocalyptic number.

It is an amenable number.

22421252921 is a deficient number, since it is larger than the sum of its proper divisors (1).

22421252921 is an equidigital number, since it uses as much as digits as its factorization.

22421252921 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 11520, while the sum is 32.

The spelling of 22421252921 in words is "twenty-two billion, four hundred twenty-one million, two hundred fifty-two thousand, nine hundred twenty-one".