111002020021 has 2 divisors, whose sum is σ = 111002020022. Its totient is φ = 111002020020.

The previous prime is 111002020007. The next prime is 111002020037. The reversal of 111002020021 is 120020200111.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 102521636100 + 8480383921 = 320190^2 + 92089^2 .

It is a cyclic number.

It is not a de Polignac number, because 111002020021 - 2⁹ = 111002019509 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (111002020121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55501010010 + 55501010011.

It is an arithmetic number, because the mean of its divisors is an integer number (55501010011).

Almost surely, 2^111002020021 is an apocalyptic number.

It is an amenable number.

111002020021 is a deficient number, since it is larger than the sum of its proper divisors (1).

111002020021 is an equidigital number, since it uses as much as digits as its factorization.

111002020021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8, while the sum is 10.

Adding to 111002020021 its reverse (120020200111), we get a palindrome (231022220132).

The spelling of 111002020021 in words is "one hundred eleven billion, two million, twenty thousand, twenty-one".