31111122212111 has 4 divisors (see below), whose sum is σ = 32183919529800. Its totient is φ = 30038324894424.

The previous prime is 31111122212087. The next prime is 31111122212197. The reversal of 31111122212111 is 11121222111113.

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-31111122212111 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 (31111122211111) 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, 536398658801 + ... + 536398658858.

It is an arithmetic number, because the mean of its divisors is an integer number (8045979882450).

Almost surely, 2^{31111122212111} is an apocalyptic number.

31111122212111 is a deficient number, since it is larger than the sum of its proper divisors (1072797317689).

31111122212111 is a wasteful number, since it uses less digits than its factorization.

31111122212111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1072797317688.

The product of its digits is 48, while the sum is 20.

Adding to 31111122212111 its reverse (11121222111113), we get a palindrome (42232344323224).

The spelling of 31111122212111 in words is "thirty-one trillion, one hundred eleven billion, one hundred twenty-two million, two hundred twelve thousand, one hundred eleven".