22368721 has 2 divisors, whose sum is σ = 22368722. Its totient is φ = 22368720.

The previous prime is 22368713. The next prime is 22368737. The reversal of 22368721 is 12786322.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 14745600 + 7623121 = 3840^2 + 2761^2 .

It is a cyclic number.

It is not a de Polignac number, because 22368721 - 2³ = 22368713 is a prime.

It is not a weakly prime, because it can be changed into another prime (22368751) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11184360 + 11184361.

It is an arithmetic number, because the mean of its divisors is an integer number (11184361).

Almost surely, 2^22368721 is an apocalyptic number.

It is an amenable number.

22368721 is a deficient number, since it is larger than the sum of its proper divisors (1).

22368721 is an equidigital number, since it uses as much as digits as its factorization.

22368721 is an evil number, because the sum of its binary digits is even.

The product of its digits is 8064, while the sum is 31.

The square root of 22368721 is about 4729.5582246125. The cubic root of 22368721 is about 281.7606783662.

The spelling of 22368721 in words is "twenty-two million, three hundred sixty-eight thousand, seven hundred twenty-one".