22738921 has 2 divisors, whose sum is σ = 22738922. Its totient is φ = 22738920.

The previous prime is 22738913. The next prime is 22738943. The reversal of 22738921 is 12983722.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15642025 + 7096896 = 3955^2 + 2664^2 .

It is a cyclic number.

It is not a de Polignac number, because 22738921 - 2³ = 22738913 is a prime.

It is not a weakly prime, because it can be changed into another prime (22738901) 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, 11369460 + 11369461.

It is an arithmetic number, because the mean of its divisors is an integer number (11369461).

Almost surely, 2^22738921 is an apocalyptic number.

It is an amenable number.

22738921 is a deficient number, since it is larger than the sum of its proper divisors (1).

22738921 is an equidigital number, since it uses as much as digits as its factorization.

22738921 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 12096, while the sum is 34.

The square root of 22738921 is about 4768.5344708831. The cubic root of 22738921 is about 283.3065514093.

The spelling of 22738921 in words is "twenty-two million, seven hundred thirty-eight thousand, nine hundred twenty-one".