22172425 has 12 divisors (see below), whose sum is σ = 29993616. Its totient is φ = 16125200.

The previous prime is 22172413. The next prime is 22172441. The reversal of 22172425 is 52427122.

It is not a de Polignac number, because 22172425 - 2²³ = 13783817 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (25).

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 22172425.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 40039 + ... + 40588.

It is an arithmetic number, because the mean of its divisors is an integer number (2499468).

Almost surely, 2^22172425 is an apocalyptic number.

22172425 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

22172425 is a deficient number, since it is larger than the sum of its proper divisors (7821191).

22172425 is a wasteful number, since it uses less digits than its factorization.

22172425 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80648 (or 80643 counting only the distinct ones).

The product of its digits is 2240, while the sum is 25.

The square root of 22172425 is about 4708.7604526032. The cubic root of 22172425 is about 280.9340616889.

Adding to 22172425 its reverse (52427122), we get a palindrome (74599547).

The spelling of 22172425 in words is "twenty-two million, one hundred seventy-two thousand, four hundred twenty-five".