2121013112100 has 36 divisors (see below), whose sum is σ = 6136797938544. Its totient is φ = 565603496480.

The previous prime is 2121013112003. The next prime is 2121013112117. The reversal of 2121013112100 is 12113101212.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 2121013112100.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3535021554 + ... + 3535022153.

It is an arithmetic number, because the mean of its divisors is an integer number (170466609404).

Almost surely, 2^{2121013112100} is an apocalyptic number.

2121013112100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2121013112100 is an abundant number, since it is smaller than the sum of its proper divisors (4015784826444).

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

2121013112100 is a wasteful number, since it uses less digits than its factorization.

2121013112100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7070043724 (or 7070043717 counting only the distinct ones).

The product of its (nonzero) digits is 24, while the sum is 15.

Adding to 2121013112100 its reverse (12113101212), we get a palindrome (2133126213312).

The spelling of 2121013112100 in words is "two trillion, one hundred twenty-one billion, thirteen million, one hundred twelve thousand, one hundred".