212102121211111 has 16 divisors (see below), whose sum is σ = 219471509427840. Its totient is φ = 204736439587680.

The previous prime is 212102121211033. The next prime is 212102121211133. The reversal of 212102121211111 is 111112121201212.

It is a cyclic number.

It is not a de Polignac number, because 212102121211111 - 2²³ = 212102112822503 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 (212102121211711) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3275827840 + ... + 3275892586.

It is an arithmetic number, because the mean of its divisors is an integer number (13716969339240).

Almost surely, 2^{212102121211111} is an apocalyptic number.

212102121211111 is a deficient number, since it is larger than the sum of its proper divisors (7369388216729).

212102121211111 is a wasteful number, since it uses less digits than its factorization.

212102121211111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 91614.

The product of its (nonzero) digits is 32, while the sum is 19.

Adding to 212102121211111 its reverse (111112121201212), we get a palindrome (323214242412323).

The spelling of 212102121211111 in words is "two hundred twelve trillion, one hundred two billion, one hundred twenty-one million, two hundred eleven thousand, one hundred eleven".