22404621 has 4 divisors (see below), whose sum is σ = 29872832. Its totient is φ = 14936412.

The previous prime is 22404619. The next prime is 22404631. The reversal of 22404621 is 12640422.

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 22404621 - 2¹ = 22404619 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22404631) 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, 3734101 + ... + 3734106.

It is an arithmetic number, because the mean of its divisors is an integer number (7468208).

Almost surely, 2^22404621 is an apocalyptic number.

It is an amenable number.

22404621 is a deficient number, since it is larger than the sum of its proper divisors (7468211).

22404621 is an equidigital number, since it uses as much as digits as its factorization.

22404621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7468210.

The product of its (nonzero) digits is 768, while the sum is 21.

The square root of 22404621 is about 4733.3519835313. The cubic root of 22404621 is about 281.9113322161.

The spelling of 22404621 in words is "twenty-two million, four hundred four thousand, six hundred twenty-one".