22151225 has 12 divisors (see below), whose sum is σ = 27617280. Its totient is φ = 17624400.

The previous prime is 22151209. The next prime is 22151249. The reversal of 22151225 is 52215122.

It is a happy number.

It is not a de Polignac number, because 22151225 - 2⁴ = 22151209 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 22151197 and 22151206.

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, 2456 + ... + 7094.

It is an arithmetic number, because the mean of its divisors is an integer number (2301440).

Almost surely, 2^22151225 is an apocalyptic number.

22151225 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

22151225 is a deficient number, since it is larger than the sum of its proper divisors (5466055).

22151225 is a wasteful number, since it uses less digits than its factorization.

22151225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4840 (or 4835 counting only the distinct ones).

The product of its digits is 400, while the sum is 20.

The square root of 22151225 is about 4706.5087910255. The cubic root of 22151225 is about 280.8444954624.

Adding to 22151225 its reverse (52215122), we get a palindrome (74366347).

The spelling of 22151225 in words is "twenty-two million, one hundred fifty-one thousand, two hundred twenty-five".