22997021 has 2 divisors, whose sum is σ = 22997022. Its totient is φ = 22997020.

The previous prime is 22997003. The next prime is 22997047. The reversal of 22997021 is 12079922.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 22934521 + 62500 = 4789^2 + 250^2 .

It is a cyclic number.

It is not a de Polignac number, because 22997021 - 2¹⁰ = 22995997 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (22997621) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11498510 + 11498511.

It is an arithmetic number, because the mean of its divisors is an integer number (11498511).

Almost surely, 2^22997021 is an apocalyptic number.

It is an amenable number.

22997021 is a deficient number, since it is larger than the sum of its proper divisors (1).

22997021 is an equidigital number, since it uses as much as digits as its factorization.

22997021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4536, while the sum is 32.

The square root of 22997021 is about 4795.5209310355. The cubic root of 22997021 is about 284.3744193685.

The spelling of 22997021 in words is "twenty-two million, nine hundred ninety-seven thousand, twenty-one".