22570921 has 4 divisors (see below), whose sum is σ = 22665600. Its totient is φ = 22476244.

The previous prime is 22570913. The next prime is 22570939. The reversal of 22570921 is 12907522.

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 22570921 - 2³ = 22570913 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 22570921.

It is not an unprimeable number, because it can be changed into a prime (22570021) 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, 46981 + ... + 47458.

It is an arithmetic number, because the mean of its divisors is an integer number (5666400).

Almost surely, 2^22570921 is an apocalyptic number.

It is an amenable number.

22570921 is a deficient number, since it is larger than the sum of its proper divisors (94679).

22570921 is an equidigital number, since it uses as much as digits as its factorization.

22570921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 94678.

The product of its (nonzero) digits is 2520, while the sum is 28.

The square root of 22570921 is about 4750.8863383583. The cubic root of 22570921 is about 282.6071162958.

The spelling of 22570921 in words is "twenty-two million, five hundred seventy thousand, nine hundred twenty-one".