2121113103281 has 2 divisors, whose sum is σ = 2121113103282. Its totient is φ = 2121113103280.

The previous prime is 2121113103271. The next prime is 2121113103301. The reversal of 2121113103281 is 1823013111212.

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., 1548571181056 + 572541922225 = 1244416^2 + 756665^2 .

It is a cyclic number.

It is not a de Polignac number, because 2121113103281 - 2⁶ = 2121113103217 is a prime.

It is a super-2 number, since 2×2121113103281² (a number of 25 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 2121113103281.

It is not a weakly prime, because it can be changed into another prime (2121113103271) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1060556551640 + 1060556551641.

It is an arithmetic number, because the mean of its divisors is an integer number (1060556551641).

Almost surely, 2^{2121113103281} is an apocalyptic number.

It is an amenable number.

2121113103281 is a deficient number, since it is larger than the sum of its proper divisors (1).

2121113103281 is an equidigital number, since it uses as much as digits as its factorization.

2121113103281 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 576, while the sum is 26.

Adding to 2121113103281 its reverse (1823013111212), we get a palindrome (3944126214493).

The spelling of 2121113103281 in words is "two trillion, one hundred twenty-one billion, one hundred thirteen million, one hundred three thousand, two hundred eighty-one".