212021201111 has 4 divisors (see below), whose sum is σ = 212023521792. Its totient is φ = 212018880432.

The previous prime is 212021201099. The next prime is 212021201173. The reversal of 212021201111 is 111102120212.

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 212021201111 - 2¹⁰ = 212021200087 is a prime.

It is a super-2 number, since 2×212021201111² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212021201411) 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, 1017431 + ... + 1207976.

It is an arithmetic number, because the mean of its divisors is an integer number (53005880448).

Almost surely, 2^212021201111 is an apocalyptic number.

212021201111 is a deficient number, since it is larger than the sum of its proper divisors (2320681).

212021201111 is an equidigital number, since it uses as much as digits as its factorization.

212021201111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2320680.

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 212021201111 its reverse (111102120212), we get a palindrome (323123321323).

The spelling of 212021201111 in words is "two hundred twelve billion, twenty-one million, two hundred one thousand, one hundred eleven".