22118772 has 48 divisors (see below), whose sum is σ = 56391552. Its totient is φ = 6706560.

The previous prime is 22118731. The next prime is 22118773. The reversal of 22118772 is 27781122.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22118773) 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, 10078 + ... + 12074.

It is an arithmetic number, because the mean of its divisors is an integer number (1174824).

Almost surely, 2^22118772 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 22118772, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28195776).

22118772 is an abundant number, since it is smaller than the sum of its proper divisors (34272780).

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

22118772 is a wasteful number, since it uses less digits than its factorization.

22118772 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2088 (or 2086 counting only the distinct ones).

The product of its digits is 3136, while the sum is 30.

The square root of 22118772 is about 4703.0598550306. The cubic root of 22118772 is about 280.7072765497.

Adding to 22118772 its reverse (27781122), we get a palindrome (49899894).

The spelling of 22118772 in words is "twenty-two million, one hundred eighteen thousand, seven hundred seventy-two".