111200000021 has 8 divisors (see below), whose sum is σ = 121979309088. Its totient is φ = 100532394000.

The previous prime is 111199999997. The next prime is 111200000047. The reversal of 111200000021 is 120000002111.

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

It is a cyclic number.

It is not a de Polignac number, because 111200000021 - 2²² = 111195805717 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 111199999954 and 111200000008.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111200000321) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 27923675 + ... + 27927656.

It is an arithmetic number, because the mean of its divisors is an integer number (15247413636).

Almost surely, 2^111200000021 is an apocalyptic number.

111200000021 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

111200000021 is a deficient number, since it is larger than the sum of its proper divisors (10779309067).

111200000021 is a wasteful number, since it uses less digits than its factorization.

111200000021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55851523.

The product of its (nonzero) digits is 4, while the sum is 8.

Adding to 111200000021 its reverse (120000002111), we get a palindrome (231200002132).

It can be divided in two parts, 11 and 1200000021, that multiplied together give a palindrome (13200000231).

The spelling of 111200000021 in words is "one hundred eleven billion, two hundred million, twenty-one", and thus it is an aban number.