22212144 has 120 divisors (see below), whose sum is σ = 67026960. Its totient is φ = 7112448.

The previous prime is 22212133. The next prime is 22212187. The reversal of 22212144 is 44121222.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a nude number because it is divisible by every one of its digits.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 112654 + ... + 112850.

It is an arithmetic number, because the mean of its divisors is an integer number (558558).

Almost surely, 2^22212144 is an apocalyptic number.

22212144 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 22212144, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33513480).

22212144 is an abundant number, since it is smaller than the sum of its proper divisors (44814816).

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

22212144 is a wasteful number, since it uses less digits than its factorization.

22212144 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 249 (or 231 counting only the distinct ones).

The product of its digits is 256, while the sum is 18.

The square root of 22212144 is about 4712.9761297931. The cubic root of 22212144 is about 281.1017138314.

Adding to 22212144 its reverse (44121222), we get a palindrome (66333366).

The spelling of 22212144 in words is "twenty-two million, two hundred twelve thousand, one hundred forty-four".