227645221 has 4 divisors (see below), whose sum is σ = 228133152. Its totient is φ = 227157292.

The previous prime is 227645207. The next prime is 227645227. The reversal of 227645221 is 122546722.

227645221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 227645221 - 2⁵ = 227645189 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (227645227) 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, 243265 + ... + 244198.

It is an arithmetic number, because the mean of its divisors is an integer number (57033288).

Almost surely, 2^227645221 is an apocalyptic number.

It is an amenable number.

227645221 is a deficient number, since it is larger than the sum of its proper divisors (487931).

227645221 is an equidigital number, since it uses as much as digits as its factorization.

227645221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 487930.

The product of its digits is 13440, while the sum is 31.

The square root of 227645221 is about 15087.9163902774. The cubic root of 227645221 is about 610.5944406895.

The spelling of 227645221 in words is "two hundred twenty-seven million, six hundred forty-five thousand, two hundred twenty-one".