212123231231 has 2 divisors, whose sum is σ = 212123231232. Its totient is φ = 212123231230.

The previous prime is 212123231179. The next prime is 212123231239. The reversal of 212123231231 is 132132321212.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-212123231231 is a prime.

It is a super-2 number, since 2×212123231231² (a number of 23 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 212123231197 and 212123231206.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (212123231239) 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 as a sum of consecutive naturals, namely, 106061615615 + 106061615616.

It is an arithmetic number, because the mean of its divisors is an integer number (106061615616).

Almost surely, 2^212123231231 is an apocalyptic number.

212123231231 is a deficient number, since it is larger than the sum of its proper divisors (1).

212123231231 is an equidigital number, since it uses as much as digits as its factorization.

212123231231 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 864, while the sum is 23.

Adding to 212123231231 its reverse (132132321212), we get a palindrome (344255552443).

The spelling of 212123231231 in words is "two hundred twelve billion, one hundred twenty-three million, two hundred thirty-one thousand, two hundred thirty-one".