220911121 has 2 divisors, whose sum is σ = 220911122. Its totient is φ = 220911120.

The previous prime is 220911079. The next prime is 220911133. The reversal of 220911121 is 121119022.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 200081025 + 20830096 = 14145^2 + 4564^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-220911121 is a prime.

It is not a weakly prime, because it can be changed into another prime (220911151) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110455560 + 110455561.

It is an arithmetic number, because the mean of its divisors is an integer number (110455561).

Almost surely, 2^220911121 is an apocalyptic number.

It is an amenable number.

220911121 is a deficient number, since it is larger than the sum of its proper divisors (1).

220911121 is an equidigital number, since it uses as much as digits as its factorization.

220911121 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 72, while the sum is 19.

The square root of 220911121 is about 14863.0791224430. The cubic root of 220911121 is about 604.5132993489.

The spelling of 220911121 in words is "two hundred twenty million, nine hundred eleven thousand, one hundred twenty-one".