2100100200121 has 12 divisors (see below), whose sum is σ = 2638142401216. Its totient is φ = 1636441713720.

The previous prime is 2100100200089. The next prime is 2100100200127. The reversal of 2100100200121 is 1210020010012.

It is not a de Polignac number, because 2100100200121 - 2⁵ = 2100100200089 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2100100200098 and 2100100200107.

It is not an unprimeable number, because it can be changed into a prime (2100100200127) 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, 1239727725 + ... + 1239729418.

Almost surely, 2^{2100100200121} is an apocalyptic number.

It is an amenable number.

2100100200121 is a deficient number, since it is larger than the sum of its proper divisors (538042201095).

2100100200121 is a wasteful number, since it uses less digits than its factorization.

2100100200121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2479457172 (or 2479457161 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 10.

Adding to 2100100200121 its reverse (1210020010012), we get a palindrome (3310120210133).

The spelling of 2100100200121 in words is "two trillion, one hundred billion, one hundred million, two hundred thousand, one hundred twenty-one".