222832721 has 2 divisors, whose sum is σ = 222832722. Its totient is φ = 222832720.

The previous prime is 222832711. The next prime is 222832739. The reversal of 222832721 is 127238222.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 153760000 + 69072721 = 12400^2 + 8311^2 .

It is a cyclic number.

It is not a de Polignac number, because 222832721 - 2⁶ = 222832657 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 (222832711) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 111416360 + 111416361.

It is an arithmetic number, because the mean of its divisors is an integer number (111416361).

Almost surely, 2^222832721 is an apocalyptic number.

It is an amenable number.

222832721 is a deficient number, since it is larger than the sum of its proper divisors (1).

222832721 is an equidigital number, since it uses as much as digits as its factorization.

222832721 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5376, while the sum is 29.

The square root of 222832721 is about 14927.5825571323. The cubic root of 222832721 is about 606.2610320591.

The spelling of 222832721 in words is "two hundred twenty-two million, eight hundred thirty-two thousand, seven hundred twenty-one".