221264255 has 32 divisors (see below), whose sum is σ = 287280000. Its totient is φ = 163164672.

The previous prime is 221264243. The next prime is 221264257. The reversal of 221264255 is 552462122.

It is not a de Polignac number, because 221264255 - 2⁶ = 221264191 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221264257) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 633821 + ... + 634169.

It is an arithmetic number, because the mean of its divisors is an integer number (8977500).

Almost surely, 2^221264255 is an apocalyptic number.

221264255 is a deficient number, since it is larger than the sum of its proper divisors (66015745).

221264255 is a wasteful number, since it uses less digits than its factorization.

221264255 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 563.

The product of its digits is 9600, while the sum is 29.

The square root of 221264255 is about 14874.9539495085. The cubic root of 221264255 is about 604.8352396098.

The spelling of 221264255 in words is "two hundred twenty-one million, two hundred sixty-four thousand, two hundred fifty-five".