212100010211111 has 4 divisors (see below), whose sum is σ = 231381829321224. Its totient is φ = 192818191101000.

The previous prime is 212100010211053. The next prime is 212100010211149. The reversal of 212100010211111 is 111112010001212.

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 212100010211111 - 2²² = 212100006016807 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 (212100010210111) 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, 9640909555040 + ... + 9640909555061.

It is an arithmetic number, because the mean of its divisors is an integer number (57845457330306).

Almost surely, 2^{212100010211111} is an apocalyptic number.

212100010211111 is a deficient number, since it is larger than the sum of its proper divisors (19281819110113).

212100010211111 is a wasteful number, since it uses less digits than its factorization.

212100010211111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19281819110112.

The product of its (nonzero) digits is 8, while the sum is 14.

Adding to 212100010211111 its reverse (111112010001212), we get a palindrome (323212020212323).

The spelling of 212100010211111 in words is "two hundred twelve trillion, one hundred billion, ten million, two hundred eleven thousand, one hundred eleven".