212122111 has 4 divisors (see below), whose sum is σ = 212173912. Its totient is φ = 212070312.

The previous prime is 212122109. The next prime is 212122121. The reversal of 212122111 is 111221212.

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 212122111 - 2¹ = 212122109 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 212122091 and 212122100.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212122121) 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, 19176 + ... + 28141.

It is an arithmetic number, because the mean of its divisors is an integer number (53043478).

Almost surely, 2^212122111 is an apocalyptic number.

212122111 is a deficient number, since it is larger than the sum of its proper divisors (51801).

212122111 is an equidigital number, since it uses as much as digits as its factorization.

212122111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51800.

The product of its digits is 16, while the sum is 13.

The square root of 212122111 is about 14564.4124838594. The cubic root of 212122111 is about 596.3876573168.

Adding to 212122111 its reverse (111221212), we get a palindrome (323343323).

The spelling of 212122111 in words is "two hundred twelve million, one hundred twenty-two thousand, one hundred eleven".