221156255 has 16 divisors (see below), whose sum is σ = 274294944. Its totient is φ = 171064320.

The previous prime is 221156251. The next prime is 221156269. The reversal of 221156255 is 552651122.

It is not a de Polignac number, because 221156255 - 2² = 221156251 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221156251) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 18392 + ... + 27938.

It is an arithmetic number, because the mean of its divisors is an integer number (17143434).

Almost surely, 2^221156255 is an apocalyptic number.

221156255 is a deficient number, since it is larger than the sum of its proper divisors (53138689).

221156255 is a wasteful number, since it uses less digits than its factorization.

221156255 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9706.

The product of its digits is 6000, while the sum is 29.

The square root of 221156255 is about 14871.3232430742. The cubic root of 221156255 is about 604.7368160652.

The spelling of 221156255 in words is "two hundred twenty-one million, one hundred fifty-six thousand, two hundred fifty-five".