220874921 has 2 divisors, whose sum is σ = 220874922. Its totient is φ = 220874920.

The previous prime is 220874909. The next prime is 220874963. The reversal of 220874921 is 129478022.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 220849321 + 25600 = 14861^2 + 160^2 .

It is a cyclic number.

It is not a de Polignac number, because 220874921 - 2¹⁰ = 220873897 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (220874821) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110437460 + 110437461.

It is an arithmetic number, because the mean of its divisors is an integer number (110437461).

Almost surely, 2^220874921 is an apocalyptic number.

It is an amenable number.

220874921 is a deficient number, since it is larger than the sum of its proper divisors (1).

220874921 is an equidigital number, since it uses as much as digits as its factorization.

220874921 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 16128, while the sum is 35.

The square root of 220874921 is about 14861.8612898923. The cubic root of 220874921 is about 604.4802776571.

The spelling of 220874921 in words is "two hundred twenty million, eight hundred seventy-four thousand, nine hundred twenty-one".