22559921 has 4 divisors (see below), whose sum is σ = 22601712. Its totient is φ = 22518132.

The previous prime is 22559893. The next prime is 22559959. The reversal of 22559921 is 12995522.

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, and also an emirpimes, since its reverse is a distinct semiprime: 12995522 = 2 ⋅6497761.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-22559921 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (22559321) 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, 20075 + ... + 21168.

It is an arithmetic number, because the mean of its divisors is an integer number (5650428).

Almost surely, 2^22559921 is an apocalyptic number.

It is an amenable number.

22559921 is a deficient number, since it is larger than the sum of its proper divisors (41791).

22559921 is an equidigital number, since it uses as much as digits as its factorization.

22559921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41790.

The product of its digits is 16200, while the sum is 35.

The square root of 22559921 is about 4749.7285185577. The cubic root of 22559921 is about 282.5611990523.

The spelling of 22559921 in words is "twenty-two million, five hundred fifty-nine thousand, nine hundred twenty-one".