22259921 has 2 divisors, whose sum is σ = 22259922. Its totient is φ = 22259920.

The previous prime is 22259917. The next prime is 22259927. The reversal of 22259921 is 12995222.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 21520321 + 739600 = 4639^2 + 860^2 .

It is a cyclic number.

It is not a de Polignac number, because 22259921 - 2² = 22259917 is a prime.

It is not a weakly prime, because it can be changed into another prime (22259927) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11129960 + 11129961.

It is an arithmetic number, because the mean of its divisors is an integer number (11129961).

Almost surely, 2^22259921 is an apocalyptic number.

It is an amenable number.

22259921 is a deficient number, since it is larger than the sum of its proper divisors (1).

22259921 is an equidigital number, since it uses as much as digits as its factorization.

22259921 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6480, while the sum is 32.

The square root of 22259921 is about 4718.0420727247. The cubic root of 22259921 is about 281.3031138536.

The spelling of 22259921 in words is "twenty-two million, two hundred fifty-nine thousand, nine hundred twenty-one".