22089721 has 2 divisors, whose sum is σ = 22089722. Its totient is φ = 22089720.

The previous prime is 22089709. The next prime is 22089731. The reversal of 22089721 is 12798022.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14907321 + 7182400 = 3861^2 + 2680^2 .

It is a cyclic number.

It is not a de Polignac number, because 22089721 - 2⁹ = 22089209 is a prime.

It is not a weakly prime, because it can be changed into another prime (22089731) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11044860 + 11044861.

It is an arithmetic number, because the mean of its divisors is an integer number (11044861).

Almost surely, 2^22089721 is an apocalyptic number.

It is an amenable number.

22089721 is a deficient number, since it is larger than the sum of its proper divisors (1).

22089721 is an equidigital number, since it uses as much as digits as its factorization.

22089721 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4032, while the sum is 31.

The square root of 22089721 is about 4699.9703190552. The cubic root of 22089721 is about 280.5843281946.

The spelling of 22089721 in words is "twenty-two million, eighty-nine thousand, seven hundred twenty-one".