22112220 has 48 divisors (see below), whose sum is σ = 66679200. Its totient is φ = 5442816.

The previous prime is 22112213. The next prime is 22112221. The reversal of 22112220 is 2221122.

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

It is a junction number, because it is equal to n+sod(n) for n = 22112196 and 22112205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22112221) 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, 13395 + ... + 14954.

It is an arithmetic number, because the mean of its divisors is an integer number (1389150).

Almost surely, 2^22112220 is an apocalyptic number.

22112220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

22112220 is an abundant number, since it is smaller than the sum of its proper divisors (44566980).

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

22112220 is a wasteful number, since it uses less digits than its factorization.

22112220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28374 (or 28372 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 12.

The square root of 22112220 is about 4702.3632356508. The cubic root of 22112220 is about 280.6795568718.

Adding to 22112220 its reverse (2221122), we get a palindrome (24333342).

The spelling of 22112220 in words is "twenty-two million, one hundred twelve thousand, two hundred twenty".