2121312131213 has 16 divisors (see below), whose sum is σ = 2339814617280. Its totient is φ = 1907116224000.

The previous prime is 2121312131203. The next prime is 2121312131227. The reversal of 2121312131213 is 3121312131212.

It is a happy number.

It is not a de Polignac number, because 2121312131213 - 2⁶ = 2121312131149 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2121312131203) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 624098 + ... + 2152236.

It is an arithmetic number, because the mean of its divisors is an integer number (146238413580).

Almost surely, 2^{2121312131213} is an apocalyptic number.

It is an amenable number.

2121312131213 is a deficient number, since it is larger than the sum of its proper divisors (218502486067).

2121312131213 is a wasteful number, since it uses less digits than its factorization.

2121312131213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1529548.

The product of its digits is 432, while the sum is 23.

Adding to 2121312131213 its reverse (3121312131212), we get a palindrome (5242624262425).

Subtracting 2121312131213 from its reverse (3121312131212), we obtain a palindrome (999999999999).

The spelling of 2121312131213 in words is "two trillion, one hundred twenty-one billion, three hundred twelve million, one hundred thirty-one thousand, two hundred thirteen".