22151172 has 12 divisors (see below), whose sum is σ = 51686096. Its totient is φ = 7383720.

The previous prime is 22151167. The next prime is 22151201. The reversal of 22151172 is 27115122.

It is a tau number, because it is divible by the number of its divisors (12).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 922954 + ... + 922977.

Almost surely, 2^22151172 is an apocalyptic number.

It is an amenable number.

22151172 is an abundant number, since it is smaller than the sum of its proper divisors (29534924).

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

22151172 is a wasteful number, since it uses less digits than its factorization.

22151172 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1845938 (or 1845936 counting only the distinct ones).

The product of its digits is 280, while the sum is 21.

The square root of 22151172 is about 4706.5031605216. The cubic root of 22151172 is about 280.8442714752.

Adding to 22151172 its reverse (27115122), we get a palindrome (49266294).

The spelling of 22151172 in words is "twenty-two million, one hundred fifty-one thousand, one hundred seventy-two".