215224225 has 24 divisors (see below), whose sum is σ = 288106560. Its totient is φ = 159001920.

The previous prime is 215224181. The next prime is 215224231. The reversal of 215224225 is 522422512.

It is not a de Polignac number, because 215224225 - 2²¹ = 213127073 is a prime.

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

It is a self number, because there is not a number n which added to its sum of digits gives 215224225.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 10222 + ... + 23128.

It is an arithmetic number, because the mean of its divisors is an integer number (12004440).

Almost surely, 2^215224225 is an apocalyptic number.

215224225 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

215224225 is a deficient number, since it is larger than the sum of its proper divisors (72882335).

215224225 is a wasteful number, since it uses less digits than its factorization.

215224225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12969 (or 12964 counting only the distinct ones).

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

The square root of 215224225 is about 14670.5223151734. The cubic root of 215224225 is about 599.2808281456.

Adding to 215224225 its reverse (522422512), we get a palindrome (737646737).

The spelling of 215224225 in words is "two hundred fifteen million, two hundred twenty-four thousand, two hundred twenty-five".