111643212 has 24 divisors (see below), whose sum is σ = 261161712. Its totient is φ = 37120000.

The previous prime is 111643211. The next prime is 111643229. The reversal of 111643212 is 212346111.

It is a nude number because it is divisible by every one of its digits.

It is not an unprimeable number, because it can be changed into a prime (111643211) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6789 + ... + 16412.

It is an arithmetic number, because the mean of its divisors is an integer number (10881738).

Almost surely, 2^111643212 is an apocalyptic number.

111643212 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

111643212 is an abundant number, since it is smaller than the sum of its proper divisors (149518500).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

111643212 is a wasteful number, since it uses less digits than its factorization.

111643212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23609 (or 23607 counting only the distinct ones).

The product of its digits is 288, while the sum is 21.

The square root of 111643212 is about 10566.1351496183. The cubic root of 111643212 is about 481.5160572581.

Adding to 111643212 its reverse (212346111), we get a palindrome (323989323).

The spelling of 111643212 in words is "one hundred eleven million, six hundred forty-three thousand, two hundred twelve".