220555221 has 4 divisors (see below), whose sum is σ = 294073632. Its totient is φ = 147036812.

The previous prime is 220555217. The next prime is 220555241. The reversal of 220555221 is 122555022.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 220555221 - 2² = 220555217 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 220555191 and 220555200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (220555241) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 36759201 + ... + 36759206.

It is an arithmetic number, because the mean of its divisors is an integer number (73518408).

Almost surely, 2^220555221 is an apocalyptic number.

It is an amenable number.

220555221 is a deficient number, since it is larger than the sum of its proper divisors (73518411).

220555221 is an equidigital number, since it uses as much as digits as its factorization.

220555221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 73518410.

The product of its (nonzero) digits is 2000, while the sum is 24.

The square root of 220555221 is about 14851.1016763067. The cubic root of 220555221 is about 604.1884901024.

The spelling of 220555221 in words is "two hundred twenty million, five hundred fifty-five thousand, two hundred twenty-one".