221256255 has 16 divisors (see below), whose sum is σ = 386193024. Its totient is φ = 107275680.

The previous prime is 221256229. The next prime is 221256271. The reversal of 221256255 is 552652122.

221256255 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 221256255 - 2⁸ = 221255999 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 670309 + ... + 670638.

It is an arithmetic number, because the mean of its divisors is an integer number (24137064).

Almost surely, 2^221256255 is an apocalyptic number.

221256255 is a deficient number, since it is larger than the sum of its proper divisors (164936769).

221256255 is a wasteful number, since it uses less digits than its factorization.

221256255 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1340966.

The product of its digits is 12000, while the sum is 30.

The square root of 221256255 is about 14874.6850386823. The cubic root of 221256255 is about 604.8279500753.

The spelling of 221256255 in words is "two hundred twenty-one million, two hundred fifty-six thousand, two hundred fifty-five".