221045166 has 32 divisors (see below), whose sum is σ = 496087200. Its totient is φ = 72950400.

The previous prime is 221045147. The next prime is 221045171. The reversal of 221045166 is 661540122.

It is a hoax number, since the sum of its digits (27) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Curzon number.

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, 14811 + ... + 25718.

It is an arithmetic number, because the mean of its divisors is an integer number (15502725).

Almost surely, 2^221045166 is an apocalyptic number.

221045166 is an abundant number, since it is smaller than the sum of its proper divisors (275042034).

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

221045166 is a wasteful number, since it uses less digits than its factorization.

221045166 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40641 (or 40635 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 27.

The square root of 221045166 is about 14867.5877666823. The cubic root of 221045166 is about 604.6355439886.

Adding to 221045166 its reverse (661540122), we get a palindrome (882585288).

The spelling of 221045166 in words is "two hundred twenty-one million, forty-five thousand, one hundred sixty-six".