22523621 has 4 divisors (see below), whose sum is σ = 22623072. Its totient is φ = 22424172.

The previous prime is 22523609. The next prime is 22523653. The reversal of 22523621 is 12632522.

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 a cyclic number.

It is not a de Polignac number, because 22523621 - 2¹⁰ = 22522597 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22523671) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 49385 + ... + 49838.

It is an arithmetic number, because the mean of its divisors is an integer number (5655768).

Almost surely, 2^22523621 is an apocalyptic number.

It is an amenable number.

22523621 is a deficient number, since it is larger than the sum of its proper divisors (99451).

22523621 is an equidigital number, since it uses as much as digits as its factorization.

22523621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 99450.

The product of its digits is 1440, while the sum is 23.

The square root of 22523621 is about 4745.9057091350. The cubic root of 22523621 is about 282.4095661666.

The spelling of 22523621 in words is "twenty-two million, five hundred twenty-three thousand, six hundred twenty-one".