22161172 has 12 divisors (see below), whose sum is σ = 42307776. Its totient is φ = 10073240.

The previous prime is 22161131. The next prime is 22161179. The reversal of 22161172 is 27116122.

It is a happy number.

It is a super-2 number, since 2×22161172² = 982235088827168, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (22).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22161179) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 251788 + ... + 251875.

It is an arithmetic number, because the mean of its divisors is an integer number (3525648).

Almost surely, 2^22161172 is an apocalyptic number.

22161172 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

22161172 is a deficient number, since it is larger than the sum of its proper divisors (20146604).

22161172 is a wasteful number, since it uses less digits than its factorization.

22161172 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 503678 (or 503676 counting only the distinct ones).

The product of its digits is 336, while the sum is 22.

The square root of 22161172 is about 4707.5654005016. The cubic root of 22161172 is about 280.8865268798.

Multiplying 22161172 by its sum of digits (22), we get a palindrome (487545784).

Adding to 22161172 its reverse (27116122), we get a palindrome (49277294).

The spelling of 22161172 in words is "twenty-two million, one hundred sixty-one thousand, one hundred seventy-two".