22591021 has 2 divisors, whose sum is σ = 22591022. Its totient is φ = 22591020.

The previous prime is 22590983. The next prime is 22591027. The reversal of 22591021 is 12019522.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11634921 + 10956100 = 3411^2 + 3310^2 .

It is a cyclic number.

It is not a de Polignac number, because 22591021 - 2⁹ = 22590509 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 22590983 and 22591001.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (22591027) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11295510 + 11295511.

It is an arithmetic number, because the mean of its divisors is an integer number (11295511).

Almost surely, 2^22591021 is an apocalyptic number.

It is an amenable number.

22591021 is a deficient number, since it is larger than the sum of its proper divisors (1).

22591021 is an equidigital number, since it uses as much as digits as its factorization.

22591021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 360, while the sum is 22.

The square root of 22591021 is about 4753.0012623604. The cubic root of 22591021 is about 282.6909811011.

The spelling of 22591021 in words is "twenty-two million, five hundred ninety-one thousand, twenty-one".