225040921 has 16 divisors (see below), whose sum is σ = 271152000. Its totient is φ = 182452608.

The previous prime is 225040913. The next prime is 225040931. The reversal of 225040921 is 129040522.

It is a cyclic number.

It is not a de Polignac number, because 225040921 - 2³ = 225040913 is a prime.

It is a super-2 number, since 2×225040921² = 101286832249056482, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (225040931) 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, 138711 + ... + 140323.

It is an arithmetic number, because the mean of its divisors is an integer number (16947000).

Almost surely, 2^225040921 is an apocalyptic number.

It is an amenable number.

225040921 is a deficient number, since it is larger than the sum of its proper divisors (46111079).

225040921 is a wasteful number, since it uses less digits than its factorization.

225040921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2688.

The product of its (nonzero) digits is 1440, while the sum is 25.

The square root of 225040921 is about 15001.3639713194. The cubic root of 225040921 is about 608.2570698834.

The spelling of 225040921 in words is "two hundred twenty-five million, forty thousand, nine hundred twenty-one".