1111210010021 has 2 divisors, whose sum is σ = 1111210010022. Its totient is φ = 1111210010020.

The previous prime is 1111210010017. The next prime is 1111210010063. The reversal of 1111210010021 is 1200100121111.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 968726409121 + 142483600900 = 984239^2 + 377470^2 .

It is a cyclic number.

It is not a de Polignac number, because 1111210010021 - 2² = 1111210010017 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1111210009984 and 1111210010011.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1111210012021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 555605005010 + 555605005011.

It is an arithmetic number, because the mean of its divisors is an integer number (555605005011).

Almost surely, 2^{1111210010021} is an apocalyptic number.

It is an amenable number.

1111210010021 is a deficient number, since it is larger than the sum of its proper divisors (1).

1111210010021 is an equidigital number, since it uses as much as digits as its factorization.

1111210010021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4, while the sum is 11.

Adding to 1111210010021 its reverse (1200100121111), we get a palindrome (2311310131132).

The spelling of 1111210010021 in words is "one trillion, one hundred eleven billion, two hundred ten million, ten thousand, twenty-one".