113212121111 has 2 divisors, whose sum is σ = 113212121112. Its totient is φ = 113212121110.

The previous prime is 113212121083. The next prime is 113212121153. The reversal of 113212121111 is 111121212311.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-113212121111 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 113212121111.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (113212121311) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 56606060555 + 56606060556.

It is an arithmetic number, because the mean of its divisors is an integer number (56606060556).

Almost surely, 2^113212121111 is an apocalyptic number.

113212121111 is a deficient number, since it is larger than the sum of its proper divisors (1).

113212121111 is an equidigital number, since it uses as much as digits as its factorization.

113212121111 is an evil number, because the sum of its binary digits is even.

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

Adding to 113212121111 its reverse (111121212311), we get a palindrome (224333333422).

The spelling of 113212121111 in words is "one hundred thirteen billion, two hundred twelve million, one hundred twenty-one thousand, one hundred eleven".