21104340463 has 2 divisors, whose sum is σ = 21104340464. Its totient is φ = 21104340462.

The previous prime is 21104340461. The next prime is 21104340473. The reversal of 21104340463 is 36404340112.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21104340463 - 2¹ = 21104340461 is a prime.

Together with 21104340461, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21104340461) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10552170231 + 10552170232.

It is an arithmetic number, because the mean of its divisors is an integer number (10552170232).

Almost surely, 2^21104340463 is an apocalyptic number.

21104340463 is a deficient number, since it is larger than the sum of its proper divisors (1).

21104340463 is an equidigital number, since it uses as much as digits as its factorization.

21104340463 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6912, while the sum is 28.

Adding to 21104340463 its reverse (36404340112), we get a palindrome (57508680575).

The spelling of 21104340463 in words is "twenty-one billion, one hundred four million, three hundred forty thousand, four hundred sixty-three".