2100202012121 has 4 divisors (see below), whose sum is σ = 2128971902772. Its totient is φ = 2071432121472.

The previous prime is 2100202012087. The next prime is 2100202012213. The reversal of 2100202012121 is 1212102020012.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 642722890000 + 1457479122121 = 801700^2 + 1207261^2 .

It is a cyclic number.

It is not a de Polignac number, because 2100202012121 - 2¹⁰ = 2100202011097 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2100202012096 and 2100202012105.

It is not an unprimeable number, because it can be changed into a prime (2100202012721) 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, 14384945216 + ... + 14384945361.

It is an arithmetic number, because the mean of its divisors is an integer number (532242975693).

Almost surely, 2^{2100202012121} is an apocalyptic number.

It is an amenable number.

2100202012121 is a deficient number, since it is larger than the sum of its proper divisors (28769890651).

2100202012121 is an equidigital number, since it uses as much as digits as its factorization.

2100202012121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28769890650.

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 2100202012121 its reverse (1212102020012), we get a palindrome (3312304032133).

The spelling of 2100202012121 in words is "two trillion, one hundred billion, two hundred two million, twelve thousand, one hundred twenty-one".