2121125100 has 36 divisors (see below), whose sum is σ = 6137122824. Its totient is φ = 565633280.

The previous prime is 2121125099. The next prime is 2121125101. The reversal of 2121125100 is 15211212.

It is an interprime number because it is at equal distance from previous prime (2121125099) and next prime (2121125101).

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 2121125100.

It is not an unprimeable number, because it can be changed into a prime (2121125101) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3534909 + ... + 3535508.

It is an arithmetic number, because the mean of its divisors is an integer number (170475634).

Almost surely, 2^2121125100 is an apocalyptic number.

2121125100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2121125100 is an abundant number, since it is smaller than the sum of its proper divisors (4015997724).

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

2121125100 is a wasteful number, since it uses less digits than its factorization.

2121125100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7070434 (or 7070427 counting only the distinct ones).

The product of its (nonzero) digits is 40, while the sum is 15.

The square root of 2121125100 is about 46055.6739175533. The cubic root of 2121125100 is about 1284.8588720944.

Adding to 2121125100 its reverse (15211212), we get a palindrome (2136336312).

The spelling of 2121125100 in words is "two billion, one hundred twenty-one million, one hundred twenty-five thousand, one hundred".