22239921 has 24 divisors (see below), whose sum is σ = 32864832. Its totient is φ = 13367200.

The previous prime is 22239911. The next prime is 22239947. The reversal of 22239921 is 12993222.

It is a happy number.

It is not a de Polignac number, because 22239921 - 2⁶ = 22239857 is a prime.

It is a super-2 number, since 2×22239921² = 989228172172482, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (22239911) 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 23 ways as a sum of consecutive naturals, for example, 71356 + ... + 71666.

It is an arithmetic number, because the mean of its divisors is an integer number (1369368).

Almost surely, 2^22239921 is an apocalyptic number.

It is an amenable number.

22239921 is a deficient number, since it is larger than the sum of its proper divisors (10624911).

22239921 is a wasteful number, since it uses less digits than its factorization.

22239921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 533 (or 522 counting only the distinct ones).

The product of its digits is 3888, while the sum is 30.

The square root of 22239921 is about 4715.9220731475. The cubic root of 22239921 is about 281.2188405974.

The spelling of 22239921 in words is "twenty-two million, two hundred thirty-nine thousand, nine hundred twenty-one".