21104003424281 has 2 divisors, whose sum is σ = 21104003424282. Its totient is φ = 21104003424280.

The previous prime is 21104003424269. The next prime is 21104003424323. The reversal of 21104003424281 is 18242430040112.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13380378726400 + 7723624697881 = 3657920^2 + 2779141^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21104003424281 is a prime.

It is a super-2 number, since 2×21104003424281² (a number of 27 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (21104003424211) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10552001712140 + 10552001712141.

It is an arithmetic number, because the mean of its divisors is an integer number (10552001712141).

Almost surely, 2^{21104003424281} is an apocalyptic number.

It is an amenable number.

21104003424281 is a deficient number, since it is larger than the sum of its proper divisors (1).

21104003424281 is an equidigital number, since it uses as much as digits as its factorization.

21104003424281 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 12288, while the sum is 32.

Adding to 21104003424281 its reverse (18242430040112), we get a palindrome (39346433464393).

The spelling of 21104003424281 in words is "twenty-one trillion, one hundred four billion, three million, four hundred twenty-four thousand, two hundred eighty-one".