2101312120 has 16 divisors (see below), whose sum is σ = 4727952360. Its totient is φ = 840524832.

The previous prime is 2101312111. The next prime is 2101312127. The reversal of 2101312120 is 212131012.

It is a self number, because there is not a number n which added to its sum of digits gives 2101312120.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2101312127) 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, 26266362 + ... + 26266441.

Almost surely, 2^2101312120 is an apocalyptic number.

2101312120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2101312120 is an abundant number, since it is smaller than the sum of its proper divisors (2626640240).

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

2101312120 is a wasteful number, since it uses less digits than its factorization.

2101312120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52532814 (or 52532810 counting only the distinct ones).

The product of its (nonzero) digits is 24, while the sum is 13.

The square root of 2101312120 is about 45840.0711168733. The cubic root of 2101312120 is about 1280.8458195430.

Adding to 2101312120 its reverse (212131012), we get a palindrome (2313443132).

It can be divided in two parts, 21013 and 12120, that added together give a palindrome (33133).

The spelling of 2101312120 in words is "two billion, one hundred one million, three hundred twelve thousand, one hundred twenty".