22551312 has 80 divisors (see below), whose sum is σ = 68245632. Its totient is φ = 6282240.

The previous prime is 22551311. The next prime is 22551317. The reversal of 22551312 is 21315522.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is not an unprimeable number, because it can be changed into a prime (22551311) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12958 + ... + 14594.

Almost surely, 2^22551312 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 22551312, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34122816).

22551312 is an abundant number, since it is smaller than the sum of its proper divisors (45694320).

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

22551312 is a wasteful number, since it uses less digits than its factorization.

22551312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1696 (or 1690 counting only the distinct ones).

The product of its digits is 600, while the sum is 21.

The square root of 22551312 is about 4748.8221697596. The cubic root of 22551312 is about 282.5252521348.

Adding to 22551312 its reverse (21315522), we get a palindrome (43866834).

The spelling of 22551312 in words is "twenty-two million, five hundred fifty-one thousand, three hundred twelve".