111101994821 has 2 divisors, whose sum is σ = 111101994822. Its totient is φ = 111101994820.

The previous prime is 111101994793. The next prime is 111101994877. The reversal of 111101994821 is 128499101111.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 71923730596 + 39178264225 = 268186^2 + 197935^2 .

It is an emirp because it is prime and its reverse (128499101111) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 111101994821 - 2³⁴ = 93922125637 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (111101996821) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55550997410 + 55550997411.

It is an arithmetic number, because the mean of its divisors is an integer number (55550997411).

Almost surely, 2^111101994821 is an apocalyptic number.

It is an amenable number.

111101994821 is a deficient number, since it is larger than the sum of its proper divisors (1).

111101994821 is an equidigital number, since it uses as much as digits as its factorization.

111101994821 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5184, while the sum is 38.

The spelling of 111101994821 in words is "one hundred eleven billion, one hundred one million, nine hundred ninety-four thousand, eight hundred twenty-one".