225421215 has 32 divisors (see below), whose sum is σ = 365091840. Its totient is φ = 118763904.

The previous prime is 225421177. The next prime is 225421283. The reversal of 225421215 is 512124522.

It is not a de Polignac number, because 225421215 - 2⁷ = 225421087 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 813657 + ... + 813933.

It is an arithmetic number, because the mean of its divisors is an integer number (11409120).

Almost surely, 2^225421215 is an apocalyptic number.

225421215 is a deficient number, since it is larger than the sum of its proper divisors (139670625).

225421215 is a wasteful number, since it uses less digits than its factorization.

225421215 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 751.

The product of its digits is 1600, while the sum is 24.

The square root of 225421215 is about 15014.0339349557. The cubic root of 225421215 is about 608.5995058807.

Adding to 225421215 its reverse (512124522), we get a palindrome (737545737).

The spelling of 225421215 in words is "two hundred twenty-five million, four hundred twenty-one thousand, two hundred fifteen".