2101220168 has 16 divisors (see below), whose sum is σ = 3940777980. Its totient is φ = 1050346048.

The previous prime is 2101220167. The next prime is 2101220171. The reversal of 2101220168 is 8610221012.

It can be written as a sum of positive squares in 2 ways, for example, as 1735722244 + 365497924 = 41662^2 + 19118^2 .

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

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3146 + ... + 64902.

Almost surely, 2^2101220168 is an apocalyptic number.

It is an amenable number.

2101220168 is a deficient number, since it is larger than the sum of its proper divisors (1839557812).

2101220168 is a wasteful number, since it uses less digits than its factorization.

2101220168 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66016 (or 66012 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 23.

The square root of 2101220168 is about 45839.0681406156. The cubic root of 2101220168 is about 1280.8271362877.

The spelling of 2101220168 in words is "two billion, one hundred one million, two hundred twenty thousand, one hundred sixty-eight".