12011112110021 has 2 divisors, whose sum is σ = 12011112110022. Its totient is φ = 12011112110020.

The previous prime is 12011112110009. The next prime is 12011112110059. The reversal of 12011112110021 is 12001121111021.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 7817979484225 + 4193132625796 = 2796065^2 + 2047714^2 .

It is a cyclic number.

It is not a de Polignac number, because 12011112110021 - 2⁶ = 12011112109957 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 12011112109978 and 12011112110005.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12011112110821) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6005556055010 + 6005556055011.

It is an arithmetic number, because the mean of its divisors is an integer number (6005556055011).

Almost surely, 2^{12011112110021} is an apocalyptic number.

It is an amenable number.

12011112110021 is a deficient number, since it is larger than the sum of its proper divisors (1).

12011112110021 is an equidigital number, since it uses as much as digits as its factorization.

12011112110021 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 14.

Adding to 12011112110021 its reverse (12001121111021), we get a palindrome (24012233221042).

The spelling of 12011112110021 in words is "twelve trillion, eleven billion, one hundred twelve million, one hundred ten thousand, twenty-one".