211121111231 has 2 divisors, whose sum is σ = 211121111232. Its totient is φ = 211121111230.

The previous prime is 211121111219. The next prime is 211121111263. The reversal of 211121111231 is 132111121112.

211121111231 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-211121111231 is a prime.

It is a super-2 number, since 2×211121111231² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (211121114231) 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 as a sum of consecutive naturals, namely, 105560555615 + 105560555616.

It is an arithmetic number, because the mean of its divisors is an integer number (105560555616).

Almost surely, 2^211121111231 is an apocalyptic number.

211121111231 is a deficient number, since it is larger than the sum of its proper divisors (1).

211121111231 is an equidigital number, since it uses as much as digits as its factorization.

211121111231 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 24, while the sum is 17.

Adding to 211121111231 its reverse (132111121112), we get a palindrome (343232232343).

The spelling of 211121111231 in words is "two hundred eleven billion, one hundred twenty-one million, one hundred eleven thousand, two hundred thirty-one".