220155221 has 8 divisors (see below), whose sum is σ = 258644064. Its totient is φ = 184745520.

The previous prime is 220155209. The next prime is 220155311. The reversal of 220155221 is 122551022.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 220155221 - 2¹⁸ = 219893077 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 220155193 and 220155202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (220157221) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 769631 + ... + 769916.

It is an arithmetic number, because the mean of its divisors is an integer number (32330508).

Almost surely, 2^220155221 is an apocalyptic number.

It is an amenable number.

220155221 is a deficient number, since it is larger than the sum of its proper divisors (38488843).

220155221 is a wasteful number, since it uses less digits than its factorization.

220155221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1539571.

The product of its (nonzero) digits is 400, while the sum is 20.

The square root of 220155221 is about 14837.6285504120. The cubic root of 220155221 is about 603.8230160297.

The spelling of 220155221 in words is "two hundred twenty million, one hundred fifty-five thousand, two hundred twenty-one".