2121212121113 has 4 divisors (see below), whose sum is σ = 2121543722340. Its totient is φ = 2120880519888.

The previous prime is 2121212121107. The next prime is 2121212121137. The reversal of 2121212121113 is 3111212121212.

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 134104637209 + 1987107483904 = 366203^2 + 1409648^2 .

It is a cyclic number.

It is not a de Polignac number, because 2121212121113 - 2¹⁰ = 2121212120089 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2121212124113) 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, 165791018 + ... + 165803811.

It is an arithmetic number, because the mean of its divisors is an integer number (530385930585).

Almost surely, 2^{2121212121113} is an apocalyptic number.

It is an amenable number.

2121212121113 is a deficient number, since it is larger than the sum of its proper divisors (331601227).

2121212121113 is an equidigital number, since it uses as much as digits as its factorization.

2121212121113 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 331601226.

The product of its digits is 96, while the sum is 20.

Adding to 2121212121113 its reverse (3111212121212), we get a palindrome (5232424242325).

Subtracting 2121212121113 from its reverse (3111212121212), we obtain a palindrome (990000000099).

The spelling of 2121212121113 in words is "two trillion, one hundred twenty-one billion, two hundred twelve million, one hundred twenty-one thousand, one hundred thirteen".