31112321212111 has 4 divisors (see below), whose sum is σ = 31112474728312. Its totient is φ = 31112167695912.

The previous prime is 31112321212103. The next prime is 31112321212127. The reversal of 31112321212111 is 11121212321113.

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 31112321212111 - 2³ = 31112321212103 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 (31112321212171) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 76453701 + ... + 76859566.

It is an arithmetic number, because the mean of its divisors is an integer number (7778118682078).

Almost surely, 2^{31112321212111} is an apocalyptic number.

31112321212111 is a deficient number, since it is larger than the sum of its proper divisors (153516201).

31112321212111 is a wasteful number, since it uses less digits than its factorization.

31112321212111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 153516200.

The product of its digits is 144, while the sum is 22.

Adding to 31112321212111 its reverse (11121212321113), we get a palindrome (42233533533224).

The spelling of 31112321212111 in words is "thirty-one trillion, one hundred twelve billion, three hundred twenty-one million, two hundred twelve thousand, one hundred eleven".