2101220166 has 8 divisors (see below), whose sum is σ = 4202440344. Its totient is φ = 700406720.

The previous prime is 2101220087. The next prime is 2101220167. The reversal of 2101220166 is 6610221012.

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

2101220166 is an admirable number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2101220167) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 175101675 + ... + 175101686.

It is an arithmetic number, because the mean of its divisors is an integer number (525305043).

Almost surely, 2^2101220166 is an apocalyptic number.

2101220166 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

2101220166 is a wasteful number, since it uses less digits than its factorization.

2101220166 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 350203366.

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

The square root of 2101220166 is about 45839.0681188001. The cubic root of 2101220166 is about 1280.8271358813.

Adding to 2101220166 its reverse (6610221012), we get a palindrome (8711441178).

The spelling of 2101220166 in words is "two billion, one hundred one million, two hundred twenty thousand, one hundred sixty-six".