221775855 has 16 divisors (see below), whose sum is σ = 405533184. Its totient is φ = 101383200.

The previous prime is 221775823. The next prime is 221775871. The reversal of 221775855 is 558577122.

It is not a de Polignac number, because 221775855 - 2⁵ = 221775823 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, 1055971 + ... + 1056180.

It is an arithmetic number, because the mean of its divisors is an integer number (25345824).

Almost surely, 2^221775855 is an apocalyptic number.

221775855 is a deficient number, since it is larger than the sum of its proper divisors (183757329).

221775855 is a wasteful number, since it uses less digits than its factorization.

221775855 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2112166.

The product of its digits is 196000, while the sum is 42.

The square root of 221775855 is about 14892.1407124698. The cubic root of 221775855 is about 605.3010409009.

The spelling of 221775855 in words is "two hundred twenty-one million, seven hundred seventy-five thousand, eight hundred fifty-five".