225139221 has 12 divisors (see below), whose sum is σ = 330713760. Its totient is φ = 147548520.

The previous prime is 225139207. The next prime is 225139223. The reversal of 225139221 is 122931522.

It is a happy number.

225139221 is a `hidden beast` number, since 2 + 251 + 392 + 21 = 666.

It is not a de Polignac number, because 225139221 - 2¹³ = 225131029 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (225139223) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 211465 + ... + 212526.

It is an arithmetic number, because the mean of its divisors is an integer number (27559480).

Almost surely, 2^225139221 is an apocalyptic number.

It is an amenable number.

225139221 is a deficient number, since it is larger than the sum of its proper divisors (105574539).

225139221 is a wasteful number, since it uses less digits than its factorization.

225139221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 424056 (or 424053 counting only the distinct ones).

The product of its digits is 2160, while the sum is 27.

The square root of 225139221 is about 15004.6399823521. The cubic root of 225139221 is about 608.3456211358.

The spelling of 225139221 in words is "two hundred twenty-five million, one hundred thirty-nine thousand, two hundred twenty-one".