22587921 has 12 divisors (see below), whose sum is σ = 32722560. Its totient is φ = 15014520.

The previous prime is 22587889. The next prime is 22587967. The reversal of 22587921 is 12978522.

It is not a de Polignac number, because 22587921 - 2⁵ = 22587889 is a prime.

It is not an unprimeable number, because it can be changed into a prime (22587991) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 265 + ... + 6726.

It is an arithmetic number, because the mean of its divisors is an integer number (2726880).

Almost surely, 2^22587921 is an apocalyptic number.

It is an amenable number.

22587921 is a deficient number, since it is larger than the sum of its proper divisors (10134639).

22587921 is a wasteful number, since it uses less digits than its factorization.

22587921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7356 (or 7353 counting only the distinct ones).

The product of its digits is 20160, while the sum is 36.

The square root of 22587921 is about 4752.6751414335. The cubic root of 22587921 is about 282.6780499735.

The spelling of 22587921 in words is "twenty-two million, five hundred eighty-seven thousand, nine hundred twenty-one".