213131121313 has 4 divisors (see below), whose sum is σ = 232506677808. Its totient is φ = 193755564820.

The previous prime is 213131121299. The next prime is 213131121317. The reversal of 213131121313 is 313121131312.

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 a cyclic number.

It is not a de Polignac number, because 213131121313 - 2²¹ = 213129024161 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (213131121317) 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, 9687778231 + ... + 9687778252.

It is an arithmetic number, because the mean of its divisors is an integer number (58126669452).

Almost surely, 2^213131121313 is an apocalyptic number.

It is an amenable number.

213131121313 is a deficient number, since it is larger than the sum of its proper divisors (19375556495).

213131121313 is a wasteful number, since it uses less digits than its factorization.

213131121313 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19375556494.

The product of its digits is 324, while the sum is 22.

Adding to 213131121313 its reverse (313121131312), we get a palindrome (526252252625).

Subtracting 213131121313 from its reverse (313121131312), we obtain a palindrome (99990009999).

The spelling of 213131121313 in words is "two hundred thirteen billion, one hundred thirty-one million, one hundred twenty-one thousand, three hundred thirteen".