111200021121 has 32 divisors (see below), whose sum is σ = 187215833088. Its totient is φ = 57204829440.

The previous prime is 111200021047. The next prime is 111200021147. The reversal of 111200021121 is 121120002111.

It is not a de Polignac number, because 111200021121 - 2¹³ = 111200012929 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 111200021097 and 111200021106.

It is not an unprimeable number, because it can be changed into a prime (111200021921) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 6763195 + ... + 6779616.

It is an arithmetic number, because the mean of its divisors is an integer number (5850494784).

Almost surely, 2^111200021121 is an apocalyptic number.

It is an amenable number.

111200021121 is a deficient number, since it is larger than the sum of its proper divisors (76015811967).

111200021121 is a wasteful number, since it uses less digits than its factorization.

111200021121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13542861.

The product of its (nonzero) digits is 8, while the sum is 12.

Adding to 111200021121 its reverse (121120002111), we get a palindrome (232320023232).

The spelling of 111200021121 in words is "one hundred eleven billion, two hundred million, twenty-one thousand, one hundred twenty-one".