2121212121213 has 4 divisors (see below), whose sum is σ = 2828282828288. Its totient is φ = 1414141414140.

The previous prime is 2121212121181. The next prime is 2121212121233. The reversal of 2121212121213 is 3121212121212.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 2121212121213 - 2⁵ = 2121212121181 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2121212121213.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2121212121233) 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, 353535353533 + ... + 353535353538.

It is an arithmetic number, because the mean of its divisors is an integer number (707070707072).

Almost surely, 2^{2121212121213} is an apocalyptic number.

It is an amenable number.

2121212121213 is a deficient number, since it is larger than the sum of its proper divisors (707070707075).

2121212121213 is an equidigital number, since it uses as much as digits as its factorization.

2121212121213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 707070707074.

The product of its digits is 192, while the sum is 21.

Adding to 2121212121213 its reverse (3121212121212), we get a palindrome (5242424242425).

Subtracting 2121212121213 from its reverse (3121212121212), we obtain a palindrome (999999999999).

The spelling of 2121212121213 in words is "two trillion, one hundred twenty-one billion, two hundred twelve million, one hundred twenty-one thousand, two hundred thirteen".