111800821 has 8 divisors (see below), whose sum is σ = 123336000. Its totient is φ = 100494240.

The previous prime is 111800747. The next prime is 111800833. The reversal of 111800821 is 128008111.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 111800821 - 2¹⁵ = 111768053 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 111800792 and 111800801.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111800851) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 56121 + ... + 58078.

It is an arithmetic number, because the mean of its divisors is an integer number (15417000).

Almost surely, 2^111800821 is an apocalyptic number.

111800821 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

111800821 is a deficient number, since it is larger than the sum of its proper divisors (11535179).

111800821 is a wasteful number, since it uses less digits than its factorization.

111800821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 114299.

The product of its (nonzero) digits is 128, while the sum is 22.

The square root of 111800821 is about 10573.5907335209. The cubic root of 111800821 is about 481.7425393955.

Adding to 111800821 its reverse (128008111), we get a palindrome (239808932).

The spelling of 111800821 in words is "one hundred eleven million, eight hundred thousand, eight hundred twenty-one".