22231312 has 20 divisors (see below), whose sum is σ = 43502796. Its totient is φ = 11004800.

The previous prime is 22231241. The next prime is 22231331. The reversal of 22231312 is 21313222.

It can be written as a sum of positive squares in 2 ways, for example, as 11182336 + 11048976 = 3344^2 + 3324^2 .

It is a Harshad number since it is a multiple of its sum of digits (16).

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5263 + ... + 8494.

Almost surely, 2^22231312 is an apocalyptic number.

It is an amenable number.

22231312 is a deficient number, since it is larger than the sum of its proper divisors (21271484).

22231312 is a wasteful number, since it uses less digits than its factorization.

22231312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13866 (or 13860 counting only the distinct ones).

The product of its digits is 144, while the sum is 16.

The square root of 22231312 is about 4715.0092258658. The cubic root of 22231312 is about 281.1825496193.

Adding to 22231312 its reverse (21313222), we get a palindrome (43544534).

The spelling of 22231312 in words is "twenty-two million, two hundred thirty-one thousand, three hundred twelve".