213131311122111 has 16 divisors (see below), whose sum is σ = 291856012653408. Its totient is φ = 138247088947200.

The previous prime is 213131311122077. The next prime is 213131311122179. The reversal of 213131311122111 is 111221113131312.

It is not a de Polignac number, because 213131311122111 - 2³⁷ = 212993872168639 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (213131311122181) 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 15 ways as a sum of consecutive naturals, for example, 76274391 + ... + 79019271.

It is an arithmetic number, because the mean of its divisors is an integer number (18241000790838).

Almost surely, 2^{213131311122111} is an apocalyptic number.

213131311122111 is a deficient number, since it is larger than the sum of its proper divisors (78724701531297).

213131311122111 is a wasteful number, since it uses less digits than its factorization.

213131311122111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3444442.

The product of its digits is 216, while the sum is 24.

Adding to 213131311122111 its reverse (111221113131312), we get a palindrome (324352424253423).

The spelling of 213131311122111 in words is "two hundred thirteen trillion, one hundred thirty-one billion, three hundred eleven million, one hundred twenty-two thousand, one hundred eleven".