22022172 has 24 divisors (see below), whose sum is σ = 57094800. Its totient is φ = 7340688.

The previous prime is 22022167. The next prime is 22022213. The reversal of 22022172 is 27122022.

It is a happy number.

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

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 101847 + ... + 102062.

It is an arithmetic number, because the mean of its divisors is an integer number (2378950).

Almost surely, 2^22022172 is an apocalyptic number.

It is an amenable number.

22022172 is an abundant number, since it is smaller than the sum of its proper divisors (35072628).

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

22022172 is a wasteful number, since it uses less digits than its factorization.

22022172 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 203922 (or 203914 counting only the distinct ones).

The product of its (nonzero) digits is 224, while the sum is 18.

The square root of 22022172 is about 4692.7787077594. The cubic root of 22022172 is about 280.2980330002.

Adding to 22022172 its reverse (27122022), we get a palindrome (49144194).

The spelling of 22022172 in words is "twenty-two million, twenty-two thousand, one hundred seventy-two".