22239231 has 32 divisors (see below), whose sum is σ = 34951680. Its totient is φ = 12317184.

The previous prime is 22239227. The next prime is 22239233. The reversal of 22239231 is 13293222.

It is not a de Polignac number, because 22239231 - 2² = 22239227 is a prime.

It is a super-2 number, since 2×22239231² = 989166790942722, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22239233) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 136356 + ... + 136518.

It is an arithmetic number, because the mean of its divisors is an integer number (1092240).

Almost surely, 2^22239231 is an apocalyptic number.

22239231 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

22239231 is a deficient number, since it is larger than the sum of its proper divisors (12712449).

22239231 is a wasteful number, since it uses less digits than its factorization.

22239231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 335.

The product of its digits is 1296, while the sum is 24.

The square root of 22239231 is about 4715.8489161550. The cubic root of 22239231 is about 281.2159322686.

The spelling of 22239231 in words is "twenty-two million, two hundred thirty-nine thousand, two hundred thirty-one".