222517221 has 4 divisors (see below), whose sum is σ = 296689632. Its totient is φ = 148344812.

The previous prime is 222517159. The next prime is 222517231. The reversal of 222517221 is 122715222.

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 222517221 - 2⁹ = 222516709 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 222517191 and 222517200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (222517231) 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, 37086201 + ... + 37086206.

It is an arithmetic number, because the mean of its divisors is an integer number (74172408).

Almost surely, 2^222517221 is an apocalyptic number.

It is an amenable number.

222517221 is a deficient number, since it is larger than the sum of its proper divisors (74172411).

222517221 is an equidigital number, since it uses as much as digits as its factorization.

222517221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 74172410.

The product of its digits is 1120, while the sum is 24.

The square root of 222517221 is about 14917.0111282388. The cubic root of 222517221 is about 605.9747699415.

The spelling of 222517221 in words is "two hundred twenty-two million, five hundred seventeen thousand, two hundred twenty-one".