212102211211 has 4 divisors (see below), whose sum is σ = 231384230424. Its totient is φ = 192820192000.

The previous prime is 212102211199. The next prime is 212102211253. The reversal of 212102211211 is 112112201212.

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-212102211211 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (212102211311) 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, 9641009590 + ... + 9641009611.

It is an arithmetic number, because the mean of its divisors is an integer number (57846057606).

Almost surely, 2^212102211211 is an apocalyptic number.

212102211211 is a deficient number, since it is larger than the sum of its proper divisors (19282019213).

212102211211 is a wasteful number, since it uses less digits than its factorization.

212102211211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19282019212.

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 212102211211 its reverse (112112201212), we get a palindrome (324214412423).

Subtracting from 212102211211 its reverse (112112201212), we obtain a palindrome (99990009999).

The spelling of 212102211211 in words is "two hundred twelve billion, one hundred two million, two hundred eleven thousand, two hundred eleven".