221133225 has 24 divisors (see below), whose sum is σ = 372511872. Its totient is φ = 115710400.

The previous prime is 221133193. The next prime is 221133233. The reversal of 221133225 is 522331122.

It is not a de Polignac number, because 221133225 - 2⁵ = 221133193 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 23841 + ... + 31790.

It is an arithmetic number, because the mean of its divisors is an integer number (15521328).

Almost surely, 2^221133225 is an apocalyptic number.

221133225 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

221133225 is a deficient number, since it is larger than the sum of its proper divisors (151378647).

221133225 is a wasteful number, since it uses less digits than its factorization.

221133225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55697 (or 55692 counting only the distinct ones).

The product of its digits is 720, while the sum is 21.

The square root of 221133225 is about 14870.5489138767. The cubic root of 221133225 is about 604.7158240109.

Adding to 221133225 its reverse (522331122), we get a palindrome (743464347).

The spelling of 221133225 in words is "two hundred twenty-one million, one hundred thirty-three thousand, two hundred twenty-five".