212021111101211 has 4 divisors (see below), whose sum is σ = 212072410672512. Its totient is φ = 211969811529912.

The previous prime is 212021111101193. The next prime is 212021111101223. The reversal of 212021111101211 is 112101111120212.

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-212021111101211 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 212021111101211.

It is not an unprimeable number, because it can be changed into a prime (212021111101271) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 25649779451 + ... + 25649787716.

It is an arithmetic number, because the mean of its divisors is an integer number (53018102668128).

Almost surely, 2^{212021111101211} is an apocalyptic number.

212021111101211 is a deficient number, since it is larger than the sum of its proper divisors (51299571301).

212021111101211 is an equidigital number, since it uses as much as digits as its factorization.

212021111101211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51299571300.

The product of its (nonzero) digits is 16, while the sum is 17.

Adding to 212021111101211 its reverse (112101111120212), we get a palindrome (324122222221423).

The spelling of 212021111101211 in words is "two hundred twelve trillion, twenty-one billion, one hundred eleven million, one hundred one thousand, two hundred eleven".