225427921 has 16 divisors (see below), whose sum is σ = 234399744. Its totient is φ = 216687744.

The previous prime is 225427919. The next prime is 225427931. The reversal of 225427921 is 129724522.

It is a happy number.

It is not a de Polignac number, because 225427921 - 2¹ = 225427919 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (225427901) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 720061 + ... + 720373.

It is an arithmetic number, because the mean of its divisors is an integer number (14649984).

Almost surely, 2^225427921 is an apocalyptic number.

It is an amenable number.

225427921 is a deficient number, since it is larger than the sum of its proper divisors (8971823).

225427921 is a wasteful number, since it uses less digits than its factorization.

225427921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 600.

The product of its digits is 20160, while the sum is 34.

The square root of 225427921 is about 15014.2572576868. The cubic root of 225427921 is about 608.6055408462.

The spelling of 225427921 in words is "two hundred twenty-five million, four hundred twenty-seven thousand, nine hundred twenty-one".