212112111020111 has 4 divisors (see below), whose sum is σ = 224589294021312. Its totient is φ = 199634928018912.

The previous prime is 212112111020107. The next prime is 212112111020119. The reversal of 212112111020111 is 111020111211212.

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

It is not a de Polignac number, because 212112111020111 - 2² = 212112111020107 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (17), and also a Moran number because the ratio is a prime number: 12477183001183 = 212112111020111 / (2 + 1 + 2 + 1 + 1 + 2 + 1 + 1 + 1 + 0 + 2 + 0 + 1 + 1 + 1).

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 212112111020111.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212112111020119) 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, 6238591500575 + ... + 6238591500608.

It is an arithmetic number, because the mean of its divisors is an integer number (56147323505328).

Almost surely, 2^{212112111020111} is an apocalyptic number.

212112111020111 is a deficient number, since it is larger than the sum of its proper divisors (12477183001201).

212112111020111 is a wasteful number, since it uses less digits than its factorization.

212112111020111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12477183001200.

The product of its (nonzero) digits is 16, while the sum is 17.

Adding to 212112111020111 its reverse (111020111211212), we get a palindrome (323132222231323).

The spelling of 212112111020111 in words is "two hundred twelve trillion, one hundred twelve billion, one hundred eleven million, twenty thousand, one hundred eleven".