22101312 has 56 divisors (see below), whose sum is σ = 59858656. Its totient is φ = 7193088.

The previous prime is 22101311. The next prime is 22101329. The reversal of 22101312 is 21310122.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22101311) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6918 + ... + 9594.

Almost surely, 2^22101312 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 22101312, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29929328).

22101312 is an abundant number, since it is smaller than the sum of its proper divisors (37757344).

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

22101312 is a wasteful number, since it uses less digits than its factorization.

22101312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2735 (or 2725 counting only the distinct ones).

The product of its (nonzero) digits is 24, while the sum is 12.

The square root of 22101312 is about 4701.2032502329. The cubic root of 22101312 is about 280.6333960282.

Adding to 22101312 its reverse (21310122), we get a palindrome (43411434).

The spelling of 22101312 in words is "twenty-two million, one hundred one thousand, three hundred twelve".