220055221 has 2 divisors, whose sum is σ = 220055222. Its totient is φ = 220055220.

The previous prime is 220055201. The next prime is 220055233. The reversal of 220055221 is 122550022.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 219454596 + 600625 = 14814^2 + 775^2 .

It is a cyclic number.

It is not a de Polignac number, because 220055221 - 2⁵ = 220055189 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (220055201) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110027610 + 110027611.

It is an arithmetic number, because the mean of its divisors is an integer number (110027611).

Almost surely, 2^220055221 is an apocalyptic number.

It is an amenable number.

220055221 is a deficient number, since it is larger than the sum of its proper divisors (1).

220055221 is an equidigital number, since it uses as much as digits as its factorization.

220055221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 400, while the sum is 19.

The square root of 220055221 is about 14834.2583569250. The cubic root of 220055221 is about 603.7315783522.

The spelling of 220055221 in words is "two hundred twenty million, fifty-five thousand, two hundred twenty-one".