220166121 has 8 divisors (see below), whose sum is σ = 335491264. Its totient is φ = 125809200.

The previous prime is 220166117. The next prime is 220166137. The reversal of 220166121 is 121661022.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 220166121 - 2² = 220166117 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21), and also a Moran number because the ratio is a prime number: 10484101 = 220166121 / (2 + 2 + 0 + 1 + 6 + 6 + 1 + 2 + 1).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (220166171) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5242030 + ... + 5242071.

It is an arithmetic number, because the mean of its divisors is an integer number (41936408).

Almost surely, 2^220166121 is an apocalyptic number.

220166121 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

220166121 is a deficient number, since it is larger than the sum of its proper divisors (115325143).

220166121 is a wasteful number, since it uses less digits than its factorization.

220166121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10484111.

The product of its (nonzero) digits is 288, while the sum is 21.

The square root of 220166121 is about 14837.9958552360. The cubic root of 220166121 is about 603.8329810629.

The spelling of 220166121 in words is "two hundred twenty million, one hundred sixty-six thousand, one hundred twenty-one".