22524721 has 2 divisors, whose sum is σ = 22524722. Its totient is φ = 22524720.

The previous prime is 22524713. The next prime is 22524731. The reversal of 22524721 is 12742522.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 22467600 + 57121 = 4740^2 + 239^2 .

It is a cyclic number.

It is not a de Polignac number, because 22524721 - 2³ = 22524713 is a prime.

It is a super-2 number, since 2×22524721² = 1014726112255682, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (22524731) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11262360 + 11262361.

It is an arithmetic number, because the mean of its divisors is an integer number (11262361).

Almost surely, 2^22524721 is an apocalyptic number.

It is an amenable number.

22524721 is a deficient number, since it is larger than the sum of its proper divisors (1).

22524721 is an equidigital number, since it uses as much as digits as its factorization.

22524721 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2240, while the sum is 25.

The square root of 22524721 is about 4746.0215970853. The cubic root of 22524721 is about 282.4141634953.

The spelling of 22524721 in words is "twenty-two million, five hundred twenty-four thousand, seven hundred twenty-one".