221401255 has 16 divisors (see below), whose sum is σ = 274627584. Its totient is φ = 171248800.

The previous prime is 221401199. The next prime is 221401261. The reversal of 221401255 is 552104122.

It is not a de Polignac number, because 221401255 - 2²³ = 213012647 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

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, 13830 + ... + 25180.

It is an arithmetic number, because the mean of its divisors is an integer number (17164224).

Almost surely, 2^221401255 is an apocalyptic number.

221401255 is a deficient number, since it is larger than the sum of its proper divisors (53226329).

221401255 is a wasteful number, since it uses less digits than its factorization.

221401255 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11486.

The product of its (nonzero) digits is 800, while the sum is 22.

The square root of 221401255 is about 14879.5582931752. The cubic root of 221401255 is about 604.9600456277.

Adding to 221401255 its reverse (552104122), we get a palindrome (773505377).

The spelling of 221401255 in words is "two hundred twenty-one million, four hundred one thousand, two hundred fifty-five".