2100000010121 has 4 divisors (see below), whose sum is σ = 2261538472452. Its totient is φ = 1938461547792.

The previous prime is 2100000010117. The next prime is 2100000010127. The reversal of 2100000010121 is 1210100000012.

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 122430010000 + 1977570000121 = 349900^2 + 1406261^2 .

It is a cyclic number.

It is not a de Polignac number, because 2100000010121 - 2² = 2100000010117 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2100000010099 and 2100000010108.

It is not an unprimeable number, because it can be changed into a prime (2100000010127) 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, 80769231146 + ... + 80769231171.

It is an arithmetic number, because the mean of its divisors is an integer number (565384618113).

Almost surely, 2^{2100000010121} is an apocalyptic number.

It is an amenable number.

2100000010121 is a deficient number, since it is larger than the sum of its proper divisors (161538462331).

2100000010121 is a wasteful number, since it uses less digits than its factorization.

2100000010121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 161538462330.

The product of its (nonzero) digits is 4, while the sum is 8.

Adding to 2100000010121 its reverse (1210100000012), we get a palindrome (3310100010133).

The spelling of 2100000010121 in words is "two trillion, one hundred billion, ten thousand, one hundred twenty-one".