221055155 has 16 divisors (see below), whose sum is σ = 271188000. Its totient is φ = 172930560.

The previous prime is 221055151. The next prime is 221055179. The reversal of 221055155 is 551550122.

It is not a de Polignac number, because 221055155 - 2² = 221055151 is a prime.

It is not an unprimeable number, because it can be changed into a prime (221055151) 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 in 15 ways as a sum of consecutive naturals, for example, 52571 + ... + 56619.

It is an arithmetic number, because the mean of its divisors is an integer number (16949250).

Almost surely, 2^221055155 is an apocalyptic number.

221055155 is a deficient number, since it is larger than the sum of its proper divisors (50132845).

221055155 is a wasteful number, since it uses less digits than its factorization.

221055155 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4294.

The product of its (nonzero) digits is 2500, while the sum is 26.

The square root of 221055155 is about 14867.9236949885. The cubic root of 221055155 is about 604.6446516498.

The spelling of 221055155 in words is "two hundred twenty-one million, fifty-five thousand, one hundred fifty-five".