22423521 has 4 divisors (see below), whose sum is σ = 29898032. Its totient is φ = 14949012.

The previous prime is 22423469. The next prime is 22423537. The reversal of 22423521 is 12532422.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 22423521 - 2¹⁷ = 22292449 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (22443521) 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 in 3 ways as a sum of consecutive naturals, for example, 3737251 + ... + 3737256.

It is an arithmetic number, because the mean of its divisors is an integer number (7474508).

Almost surely, 2^22423521 is an apocalyptic number.

It is an amenable number.

22423521 is a deficient number, since it is larger than the sum of its proper divisors (7474511).

22423521 is an equidigital number, since it uses as much as digits as its factorization.

22423521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7474510.

The product of its digits is 960, while the sum is 21.

The square root of 22423521 is about 4735.3480336719. The cubic root of 22423521 is about 281.9905811451.

Adding to 22423521 its reverse (12532422), we get a palindrome (34955943).

The spelling of 22423521 in words is "twenty-two million, four hundred twenty-three thousand, five hundred twenty-one".