111231212999 has 4 divisors (see below), whose sum is σ = 112080306360. Its totient is φ = 110382119640.

The previous prime is 111231212957. The next prime is 111231213007. The reversal of 111231212999 is 999212132111.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-111231212999 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111231212929) 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 3 ways as a sum of consecutive naturals, for example, 424546484 + ... + 424546745.

It is an arithmetic number, because the mean of its divisors is an integer number (28020076590).

Almost surely, 2^111231212999 is an apocalyptic number.

111231212999 is a deficient number, since it is larger than the sum of its proper divisors (849093361).

111231212999 is an equidigital number, since it uses as much as digits as its factorization.

111231212999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 849093360.

The product of its digits is 17496, while the sum is 41.

The spelling of 111231212999 in words is "one hundred eleven billion, two hundred thirty-one million, two hundred twelve thousand, nine hundred ninety-nine".