212111222102111 has 4 divisors (see below), whose sum is σ = 212112093163632. Its totient is φ = 212110351040592.

The previous prime is 212111222102081. The next prime is 212111222102179. The reversal of 212111222102111 is 111201222111212.

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 212111222102111 - 2¹⁰ = 212111222101087 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 (212111222102411) 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, 435165395 + ... + 435652548.

It is an arithmetic number, because the mean of its divisors is an integer number (53028023290908).

Almost surely, 2^{212111222102111} is an apocalyptic number.

212111222102111 is a deficient number, since it is larger than the sum of its proper divisors (871061521).

212111222102111 is an equidigital number, since it uses as much as digits as its factorization.

212111222102111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 871061520.

The product of its (nonzero) digits is 64, while the sum is 20.

Adding to 212111222102111 its reverse (111201222111212), we get a palindrome (323312444213323).

The spelling of 212111222102111 in words is "two hundred twelve trillion, one hundred eleven billion, two hundred twenty-two million, one hundred two thousand, one hundred eleven".