111210200021 has 2 divisors, whose sum is σ = 111210200022. Its totient is φ = 111210200020.

The previous prime is 111210200009. The next prime is 111210200069. The reversal of 111210200021 is 120002012111.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 70642197796 + 40568002225 = 265786^2 + 201415^2 .

It is a cyclic number.

It is not a de Polignac number, because 111210200021 - 2⁶ = 111210199957 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 111210199975 and 111210200011.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (111210200081) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55605100010 + 55605100011.

It is an arithmetic number, because the mean of its divisors is an integer number (55605100011).

Almost surely, 2^111210200021 is an apocalyptic number.

It is an amenable number.

111210200021 is a deficient number, since it is larger than the sum of its proper divisors (1).

111210200021 is an equidigital number, since it uses as much as digits as its factorization.

111210200021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8, while the sum is 11.

Adding to 111210200021 its reverse (120002012111), we get a palindrome (231212212132).

The spelling of 111210200021 in words is "one hundred eleven billion, two hundred ten million, two hundred thousand, twenty-one".