2121131311213 has 4 divisors (see below), whose sum is σ = 2121714523900. Its totient is φ = 2120548098528.

The previous prime is 2121131311183. The next prime is 2121131311279. The reversal of 2121131311213 is 3121131311212.

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 1153469556009 + 967661755204 = 1073997^2 + 983698^2 .

It is a cyclic number.

It is not a de Polignac number, because 2121131311213 - 2⁵ = 2121131311181 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 (2121131341213) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 291600888 + ... + 291608161.

It is an arithmetic number, because the mean of its divisors is an integer number (530428630975).

Almost surely, 2^{2121131311213} is an apocalyptic number.

It is an amenable number.

2121131311213 is a deficient number, since it is larger than the sum of its proper divisors (583212687).

2121131311213 is an equidigital number, since it uses as much as digits as its factorization.

2121131311213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 583212686.

The product of its digits is 216, while the sum is 22.

Adding to 2121131311213 its reverse (3121131311212), we get a palindrome (5242262622425).

Subtracting 2121131311213 from its reverse (3121131311212), we obtain a palindrome (999999999999).

The spelling of 2121131311213 in words is "two trillion, one hundred twenty-one billion, one hundred thirty-one million, three hundred eleven thousand, two hundred thirteen".