225421231 has 4 divisors (see below), whose sum is σ = 257624272. Its totient is φ = 193218192.

The previous prime is 225421177. The next prime is 225421283. The reversal of 225421231 is 132124522.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-225421231 is a prime.

It is a super-2 number, since 2×225421231² = 101629462771110722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (225421331) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16101510 + ... + 16101523.

It is an arithmetic number, because the mean of its divisors is an integer number (64406068).

Almost surely, 2^225421231 is an apocalyptic number.

225421231 is a deficient number, since it is larger than the sum of its proper divisors (32203041).

225421231 is an equidigital number, since it uses as much as digits as its factorization.

225421231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32203040.

The product of its digits is 960, while the sum is 22.

The square root of 225421231 is about 15014.0344677905. The cubic root of 225421231 is about 608.5995202798.

Adding to 225421231 its reverse (132124522), we get a palindrome (357545753).

The spelling of 225421231 in words is "two hundred twenty-five million, four hundred twenty-one thousand, two hundred thirty-one".