221666122 has 16 divisors (see below), whose sum is σ = 353276640. Its totient is φ = 104016528.

The previous prime is 221666119. The next prime is 221666129.

221666122 is nontrivially palindromic in base 10.

It is not an unprimeable number, because it can be changed into a prime (221666129) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 23193 + ... + 31324.

It is an arithmetic number, because the mean of its divisors is an integer number (22079790).

Almost surely, 2^221666122 is an apocalyptic number.

221666122 is a deficient number, since it is larger than the sum of its proper divisors (131610518).

221666122 is a wasteful number, since it uses less digits than its factorization.

221666122 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 54645.

The product of its digits is 3456, while the sum is 28.

The square root of 221666122 is about 14888.4559978528. The cubic root of 221666122 is about 605.2011916528.

The spelling of 221666122 in words is "two hundred twenty-one million, six hundred sixty-six thousand, one hundred twenty-two".