221116266 has 24 divisors (see below), whose sum is σ = 547526304. Its totient is φ = 63176040.

The previous prime is 221116151. The next prime is 221116267. The reversal of 221116266 is 662611122.

221116266 is a `hidden beast` number, since 2 + 21 + 11 + 626 + 6 = 666.

It is a nude number because it is divisible by every one of its digits.

It is not an unprimeable number, because it can be changed into a prime (221116267) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 877320 + ... + 877571.

It is an arithmetic number, because the mean of its divisors is an integer number (22813596).

Almost surely, 2^221116266 is an apocalyptic number.

221116266 is an abundant number, since it is smaller than the sum of its proper divisors (326410038).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

221116266 is a wasteful number, since it uses less digits than its factorization.

221116266 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1754906 (or 1754903 counting only the distinct ones).

The product of its digits is 1728, while the sum is 27.

The square root of 221116266 is about 14869.9786818946. The cubic root of 221116266 is about 604.7003647965.

Adding to 221116266 its reverse (662611122), we get a palindrome (883727388).

The spelling of 221116266 in words is "two hundred twenty-one million, one hundred sixteen thousand, two hundred sixty-six".