22157312 has 48 divisors (see below), whose sum is σ = 45864000. Its totient is φ = 10690560.

The previous prime is 22157297. The next prime is 22157323. The reversal of 22157312 is 21375122.

It is a happy number.

It is a congruent number.

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, 63314 + ... + 63662.

It is an arithmetic number, because the mean of its divisors is an integer number (955500).

Almost surely, 2^22157312 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 22157312, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22932000).

22157312 is an abundant number, since it is smaller than the sum of its proper divisors (23706688).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

22157312 is an equidigital number, since it uses as much as digits as its factorization.

22157312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 402 (or 382 counting only the distinct ones).

The product of its digits is 840, while the sum is 23.

The square root of 22157312 is about 4707.1554042755. The cubic root of 22157312 is about 280.8702178003.

The spelling of 22157312 in words is "twenty-two million, one hundred fifty-seven thousand, three hundred twelve".