111212213 has 24 divisors (see below), whose sum is σ = 133671384. Its totient is φ = 92198400.

The previous prime is 111212203. The next prime is 111212239. The reversal of 111212213 is 312212111.

It can be written as a sum of positive squares in 4 ways, for example, as 27636049 + 83576164 = 5257^2 + 9142^2 .

It is not a de Polignac number, because 111212213 - 2¹² = 111208117 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111212203) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 395633 + ... + 395913.

It is an arithmetic number, because the mean of its divisors is an integer number (5569641).

Almost surely, 2^111212213 is an apocalyptic number.

It is an amenable number.

111212213 is a deficient number, since it is larger than the sum of its proper divisors (22459171).

111212213 is a wasteful number, since it uses less digits than its factorization.

111212213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 533 (or 526 counting only the distinct ones).

The product of its digits is 24, while the sum is 14.

The square root of 111212213 is about 10545.7201271416. The cubic root of 111212213 is about 480.8956267210.

Adding to 111212213 its reverse (312212111), we get a palindrome (423424324).

The spelling of 111212213 in words is "one hundred eleven million, two hundred twelve thousand, two hundred thirteen".