22657321 has 2 divisors, whose sum is σ = 22657322. Its totient is φ = 22657320.

The previous prime is 22657303. The next prime is 22657333. The reversal of 22657321 is 12375622.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11634921 + 11022400 = 3411^2 + 3320^2 .

It is a cyclic number.

It is not a de Polignac number, because 22657321 - 2¹⁷ = 22526249 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 22657321.

It is not a weakly prime, because it can be changed into another prime (22657301) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11328660 + 11328661.

It is an arithmetic number, because the mean of its divisors is an integer number (11328661).

Almost surely, 2^22657321 is an apocalyptic number.

It is an amenable number.

22657321 is a deficient number, since it is larger than the sum of its proper divisors (1).

22657321 is an equidigital number, since it uses as much as digits as its factorization.

22657321 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5040, while the sum is 28.

The square root of 22657321 is about 4759.9706931871. The cubic root of 22657321 is about 282.9672576336.

The spelling of 22657321 in words is "twenty-two million, six hundred fifty-seven thousand, three hundred twenty-one".