21284938463 has 2 divisors, whose sum is σ = 21284938464. Its totient is φ = 21284938462.

The previous prime is 21284938453. The next prime is 21284938469. The reversal of 21284938463 is 36483948212.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21284938463 - 2¹⁰ = 21284937439 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21284938469) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10642469231 + 10642469232.

It is an arithmetic number, because the mean of its divisors is an integer number (10642469232).

Almost surely, 2^21284938463 is an apocalyptic number.

21284938463 is a deficient number, since it is larger than the sum of its proper divisors (1).

21284938463 is an equidigital number, since it uses as much as digits as its factorization.

21284938463 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1990656, while the sum is 50.

The spelling of 21284938463 in words is "twenty-one billion, two hundred eighty-four million, nine hundred thirty-eight thousand, four hundred sixty-three".