111200018021 has 2 divisors, whose sum is σ = 111200018022. Its totient is φ = 111200018020.

The previous prime is 111200017949. The next prime is 111200018047. The reversal of 111200018021 is 120810002111.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 80709969025 + 30490048996 = 284095^2 + 174614^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-111200018021 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (111200018921) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55600009010 + 55600009011.

It is an arithmetic number, because the mean of its divisors is an integer number (55600009011).

Almost surely, 2^111200018021 is an apocalyptic number.

It is an amenable number.

111200018021 is a deficient number, since it is larger than the sum of its proper divisors (1).

111200018021 is an equidigital number, since it uses as much as digits as its factorization.

111200018021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 32, while the sum is 17.

The spelling of 111200018021 in words is "one hundred eleven billion, two hundred million, eighteen thousand, twenty-one".