22889921 has 2 divisors, whose sum is σ = 22889922. Its totient is φ = 22889920.

The previous prime is 22889917. The next prime is 22889969. The reversal of 22889921 is 12998822.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18395521 + 4494400 = 4289^2 + 2120^2 .

It is a cyclic number.

It is not a de Polignac number, because 22889921 - 2² = 22889917 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (22889621) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11444960 + 11444961.

It is an arithmetic number, because the mean of its divisors is an integer number (11444961).

Almost surely, 2^22889921 is an apocalyptic number.

It is an amenable number.

22889921 is a deficient number, since it is larger than the sum of its proper divisors (1).

22889921 is an equidigital number, since it uses as much as digits as its factorization.

22889921 is an evil number, because the sum of its binary digits is even.

The product of its digits is 41472, while the sum is 41.

The square root of 22889921 is about 4784.3412294693. The cubic root of 22889921 is about 283.9322765516.

The spelling of 22889921 in words is "twenty-two million, eight hundred eighty-nine thousand, nine hundred twenty-one".