22412521 has 2 divisors, whose sum is σ = 22412522. Its totient is φ = 22412520.

The previous prime is 22412519. The next prime is 22412531. The reversal of 22412521 is 12521422.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 21483225 + 929296 = 4635^2 + 964^2 .

It is a cyclic number.

It is not a de Polignac number, because 22412521 - 2¹ = 22412519 is a prime.

Together with 22412519, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (22412501) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11206260 + 11206261.

It is an arithmetic number, because the mean of its divisors is an integer number (11206261).

Almost surely, 2^22412521 is an apocalyptic number.

It is an amenable number.

22412521 is a deficient number, since it is larger than the sum of its proper divisors (1).

22412521 is an equidigital number, since it uses as much as digits as its factorization.

22412521 is an evil number, because the sum of its binary digits is even.

The product of its digits is 320, while the sum is 19.

The square root of 22412521 is about 4734.1864137357. The cubic root of 22412521 is about 281.9444628489.

Adding to 22412521 its reverse (12521422), we get a palindrome (34933943).

The spelling of 22412521 in words is "twenty-two million, four hundred twelve thousand, five hundred twenty-one".