22145425 has 24 divisors (see below), whose sum is σ = 28625400. Its totient is φ = 16980480.

The previous prime is 22145411. The next prime is 22145429. The reversal of 22145425 is 52454122.

It can be written as a sum of positive squares in 12 ways, for example, as 9979281 + 12166144 = 3159^2 + 3488^2 .

It is not a de Polignac number, because 22145425 - 2¹³ = 22137233 is a prime.

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

Its product of digits (3200) is a multiple of the sum of its prime divisors (400).

It is a self number, because there is not a number n which added to its sum of digits gives 22145425.

It is not an unprimeable number, because it can be changed into a prime (22145429) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 82191 + ... + 82459.

It is an arithmetic number, because the mean of its divisors is an integer number (1192725).

Almost surely, 2^22145425 is an apocalyptic number.

22145425 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

22145425 is a deficient number, since it is larger than the sum of its proper divisors (6479975).

22145425 is a wasteful number, since it uses less digits than its factorization.

22145425 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 405 (or 400 counting only the distinct ones).

The product of its digits is 3200, while the sum is 25.

The square root of 22145425 is about 4705.8925827095. The cubic root of 22145425 is about 280.8199815395.

Adding to 22145425 its reverse (52454122), we get a palindrome (74599547).

The spelling of 22145425 in words is "twenty-two million, one hundred forty-five thousand, four hundred twenty-five".