22415621 has 2 divisors, whose sum is σ = 22415622. Its totient is φ = 22415620.

The previous prime is 22415543. The next prime is 22415641. The reversal of 22415621 is 12651422.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20802721 + 1612900 = 4561^2 + 1270^2 .

It is a cyclic number.

It is not a de Polignac number, because 22415621 - 2¹⁰ = 22414597 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (22415641) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11207810 + 11207811.

It is an arithmetic number, because the mean of its divisors is an integer number (11207811).

Almost surely, 2^22415621 is an apocalyptic number.

It is an amenable number.

22415621 is a deficient number, since it is larger than the sum of its proper divisors (1).

22415621 is an equidigital number, since it uses as much as digits as its factorization.

22415621 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 960, while the sum is 23.

The square root of 22415621 is about 4734.5138081961. The cubic root of 22415621 is about 281.9574613501.

The spelling of 22415621 in words is "twenty-two million, four hundred fifteen thousand, six hundred twenty-one".