22218912 has 72 divisors (see below), whose sum is σ = 63685440. Its totient is φ = 7347840.

The previous prime is 22218877. The next prime is 22218913. The reversal of 22218912 is 21981222.

It is a tau number, because it is divible by the number of its divisors (72).

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

It is not an unprimeable number, because it can be changed into a prime (22218913) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 51337 + ... + 51767.

It is an arithmetic number, because the mean of its divisors is an integer number (884520).

Almost surely, 2^22218912 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 22218912, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31842720).

22218912 is an abundant number, since it is smaller than the sum of its proper divisors (41466528).

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

22218912 is a wasteful number, since it uses less digits than its factorization.

22218912 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 626 (or 615 counting only the distinct ones).

The product of its digits is 1152, while the sum is 27.

The square root of 22218912 is about 4713.6940927472. The cubic root of 22218912 is about 281.1302613263.

The spelling of 22218912 in words is "twenty-two million, two hundred eighteen thousand, nine hundred twelve".