221002166 has 16 divisors (see below), whose sum is σ = 413303040. Its totient is φ = 86104680.

The previous prime is 221002163. The next prime is 221002169. The reversal of 221002166 is 661200122.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (221002163) and next prime (221002169).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221002163) 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, 717386 + ... + 717693.

It is an arithmetic number, because the mean of its divisors is an integer number (25831440).

Almost surely, 2^221002166 is an apocalyptic number.

221002166 is a deficient number, since it is larger than the sum of its proper divisors (192300874).

221002166 is a wasteful number, since it uses less digits than its factorization.

221002166 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1435099.

The product of its (nonzero) digits is 288, while the sum is 20.

The square root of 221002166 is about 14866.1415976036. The cubic root of 221002166 is about 604.5963347854.

Adding to 221002166 its reverse (661200122), we get a palindrome (882202288).

The spelling of 221002166 in words is "two hundred twenty-one million, two thousand, one hundred sixty-six".