222244721 has 2 divisors, whose sum is σ = 222244722. Its totient is φ = 222244720.

The previous prime is 222244679. The next prime is 222244727. The reversal of 222244721 is 127442222.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 160402225 + 61842496 = 12665^2 + 7864^2 .

It is a cyclic number.

It is not a de Polignac number, because 222244721 - 2¹⁴ = 222228337 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (222244727) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 111122360 + 111122361.

It is an arithmetic number, because the mean of its divisors is an integer number (111122361).

Almost surely, 2^222244721 is an apocalyptic number.

It is an amenable number.

222244721 is a deficient number, since it is larger than the sum of its proper divisors (1).

222244721 is an equidigital number, since it uses as much as digits as its factorization.

222244721 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3584, while the sum is 26.

The square root of 222244721 is about 14907.8744628468. The cubic root of 222244721 is about 605.7273050838.

Adding to 222244721 its reverse (127442222), we get a palindrome (349686943).

The spelling of 222244721 in words is "two hundred twenty-two million, two hundred forty-four thousand, seven hundred twenty-one".