212111213111 has 32 divisors (see below), whose sum is σ = 268020679680. Its totient is φ = 163559886336.

The previous prime is 212111213099. The next prime is 212111213123. The reversal of 212111213111 is 111312111212.

It is an interprime number because it is at equal distance from previous prime (212111213099) and next prime (212111213123).

It is not a de Polignac number, because 212111213111 - 2⁶ = 212111213047 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (17).

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 212111213111.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212111213411) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3966725 + ... + 4019841.

It is an arithmetic number, because the mean of its divisors is an integer number (8375646240).

Almost surely, 2^212111213111 is an apocalyptic number.

212111213111 is a deficient number, since it is larger than the sum of its proper divisors (55909466569).

212111213111 is a wasteful number, since it uses less digits than its factorization.

212111213111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54623.

The product of its digits is 24, while the sum is 17.

Adding to 212111213111 its reverse (111312111212), we get a palindrome (323423324323).

The spelling of 212111213111 in words is "two hundred twelve billion, one hundred eleven million, two hundred thirteen thousand, one hundred eleven".