212111131231 has 16 divisors (see below), whose sum is σ = 241016371200. Its totient is φ = 185582583648.

The previous prime is 212111131163. The next prime is 212111131261. The reversal of 212111131231 is 132131111212.

212111131231 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 212111131231 - 2¹⁷ = 212111000159 is a prime.

It is a super-2 number, since 2×212111131231² (a number of 23 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (19).

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 212111131199 and 212111131208.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212111131261) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8355951 + ... + 8381296.

It is an arithmetic number, because the mean of its divisors is an integer number (15063523200).

Almost surely, 2^212111131231 is an apocalyptic number.

212111131231 is a deficient number, since it is larger than the sum of its proper divisors (28905239969).

212111131231 is a wasteful number, since it uses less digits than its factorization.

212111131231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16737318.

The product of its digits is 72, while the sum is 19.

Adding to 212111131231 its reverse (132131111212), we get a palindrome (344242242443).

The spelling of 212111131231 in words is "two hundred twelve billion, one hundred eleven million, one hundred thirty-one thousand, two hundred thirty-one".