212201221111 has 16 divisors (see below), whose sum is σ = 239713671168. Its totient is φ = 186098277600.

The previous prime is 212201221109. The next prime is 212201221147. The reversal of 212201221111 is 111122102212.

It is a cyclic number.

It is not a de Polignac number, because 212201221111 - 2¹ = 212201221109 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 (212201222111) 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, 873435 + ... + 1089628.

It is an arithmetic number, because the mean of its divisors is an integer number (14982104448).

Almost surely, 2^212201221111 is an apocalyptic number.

212201221111 is a deficient number, since it is larger than the sum of its proper divisors (27512450057).

212201221111 is a wasteful number, since it uses less digits than its factorization.

212201221111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1963422.

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

Adding to 212201221111 its reverse (111122102212), we get a palindrome (323323323323).

The spelling of 212201221111 in words is "two hundred twelve billion, two hundred one million, two hundred twenty-one thousand, one hundred eleven".