2101621164 has 24 divisors (see below), whose sum is σ = 5036318448. Its totient is φ = 681606720.

The previous prime is 2101621147. The next prime is 2101621183. The reversal of 2101621164 is 4611261012.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2366247 + ... + 2367134.

It is an arithmetic number, because the mean of its divisors is an integer number (209846602).

Almost surely, 2^2101621164 is an apocalyptic number.

It is an amenable number.

2101621164 is an abundant number, since it is smaller than the sum of its proper divisors (2934697284).

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

2101621164 is a wasteful number, since it uses less digits than its factorization.

2101621164 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4733425 (or 4733423 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 24.

The square root of 2101621164 is about 45843.4418864902. The cubic root of 2101621164 is about 1280.9086086146.

Adding to 2101621164 its reverse (4611261012), we get a palindrome (6712882176).

The spelling of 2101621164 in words is "two billion, one hundred one million, six hundred twenty-one thousand, one hundred sixty-four".