222352721 has 4 divisors (see below), whose sum is σ = 228362292. Its totient is φ = 216343152.

The previous prime is 222352703. The next prime is 222352727. The reversal of 222352721 is 127253222.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 138886225 + 83466496 = 11785^2 + 9136^2 .

It is a cyclic number.

It is not a de Polignac number, because 222352721 - 2¹⁸ = 222090577 is a prime.

It is a super-2 number, since 2×222352721² = 98881465072207682, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (222352727) 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, 3004730 + ... + 3004803.

It is an arithmetic number, because the mean of its divisors is an integer number (57090573).

Almost surely, 2^222352721 is an apocalyptic number.

It is an amenable number.

222352721 is a deficient number, since it is larger than the sum of its proper divisors (6009571).

222352721 is an equidigital number, since it uses as much as digits as its factorization.

222352721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6009570.

The product of its digits is 3360, while the sum is 26.

The square root of 222352721 is about 14911.4962696572. The cubic root of 222352721 is about 605.8254070841.

The spelling of 222352721 in words is "two hundred twenty-two million, three hundred fifty-two thousand, seven hundred twenty-one".