212101121111111 has 4 divisors (see below), whose sum is σ = 212101159246992. Its totient is φ = 212101082975232.

The previous prime is 212101121110897. The next prime is 212101121111179. The reversal of 212101121111111 is 111111121101212.

It is a happy number.

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-212101121111111 is a prime.

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 212101121111111.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212101121110111) 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, 8927930 + ... + 22447943.

It is an arithmetic number, because the mean of its divisors is an integer number (53025289811748).

Almost surely, 2^{212101121111111} is an apocalyptic number.

212101121111111 is a deficient number, since it is larger than the sum of its proper divisors (38135881).

212101121111111 is an equidigital number, since it uses as much as digits as its factorization.

212101121111111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38135880.

The product of its (nonzero) digits is 8, while the sum is 17.

Adding to 212101121111111 its reverse (111111121101212), we get a palindrome (323212242212323).

The spelling of 212101121111111 in words is "two hundred twelve trillion, one hundred one billion, one hundred twenty-one million, one hundred eleven thousand, one hundred eleven".