12011100121021 has 2 divisors, whose sum is σ = 12011100121022. Its totient is φ = 12011100121020.

The previous prime is 12011100121019. The next prime is 12011100121043. The reversal of 12011100121021 is 12012100111021.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 8747332692921 + 3263767428100 = 2957589^2 + 1806590^2 .

It is a cyclic number.

It is not a de Polignac number, because 12011100121021 - 2¹ = 12011100121019 is a prime.

It is a super-2 number, since 2×12011100121021² (a number of 27 digits) contains 22 as substring.

Together with 12011100121019, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 12011100120992 and 12011100121010.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12011100121091) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6005550060510 + 6005550060511.

It is an arithmetic number, because the mean of its divisors is an integer number (6005550060511).

Almost surely, 2^{12011100121021} is an apocalyptic number.

It is an amenable number.

12011100121021 is a deficient number, since it is larger than the sum of its proper divisors (1).

12011100121021 is an equidigital number, since it uses as much as digits as its factorization.

12011100121021 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 13.

Adding to 12011100121021 its reverse (12012100111021), we get a palindrome (24023200232042).

The spelling of 12011100121021 in words is "twelve trillion, eleven billion, one hundred million, one hundred twenty-one thousand, twenty-one".