100031212111 has 4 divisors (see below), whose sum is σ = 100032319224. Its totient is φ = 100030105000.

The previous prime is 100031212093. The next prime is 100031212241. The reversal of 100031212111 is 111212130001.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 100031212111 - 2⁵ = 100031212079 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 100031212091 and 100031212100.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (100031213111) 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 3 ways as a sum of consecutive naturals, for example, 404680 + ... + 603181.

It is an arithmetic number, because the mean of its divisors is an integer number (25008079806).

Almost surely, 2^100031212111 is an apocalyptic number.

100031212111 is a deficient number, since it is larger than the sum of its proper divisors (1107113).

100031212111 is an equidigital number, since it uses as much as digits as its factorization.

100031212111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1107112.

The product of its (nonzero) digits is 12, while the sum is 13.

Adding to 100031212111 its reverse (111212130001), we get a palindrome (211243342112).

The spelling of 100031212111 in words is "one hundred billion, thirty-one million, two hundred twelve thousand, one hundred eleven".