23221312 has 28 divisors (see below), whose sum is σ = 46360080. Its totient is φ = 11540096.

The previous prime is 23221309. The next prime is 23221327. The reversal of 23221312 is 21312232.

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, 10443 + ... + 12469.

Almost surely, 2^23221312 is an apocalyptic number.

It is an amenable number.

23221312 is a deficient number, since it is larger than the sum of its proper divisors (23138768).

23221312 is a wasteful number, since it uses less digits than its factorization.

23221312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2218 (or 2208 counting only the distinct ones).

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

The square root of 23221312 is about 4818.8496552601. The cubic root of 23221312 is about 285.2959355495.

Adding to 23221312 its reverse (21312232), we get a palindrome (44533544).

The spelling of 23221312 in words is "twenty-three million, two hundred twenty-one thousand, three hundred twelve".