221725227 has 6 divisors (see below), whose sum is σ = 295668028. Its totient is φ = 147799624.

The previous prime is 221725223. The next prime is 221725249. The reversal of 221725227 is 722527122.

221725227 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 221725227 - 2² = 221725223 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 221725194 and 221725203.

It is not an unprimeable number, because it can be changed into a prime (221725223) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 21493 + ... + 30089.

Almost surely, 2^221725227 is an apocalyptic number.

221725227 is a deficient number, since it is larger than the sum of its proper divisors (73942801).

221725227 is an frugal number, since it uses more digits than its factorization.

221725227 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17197 (or 8600 counting only the distinct ones).

The product of its digits is 7840, while the sum is 30.

The square root of 221725227 is about 14890.4407926696. The cubic root of 221725227 is about 605.2549771047.

The spelling of 221725227 in words is "two hundred twenty-one million, seven hundred twenty-five thousand, two hundred twenty-seven".