21246460663 has 2 divisors, whose sum is σ = 21246460664. Its totient is φ = 21246460662.

The previous prime is 21246460619. The next prime is 21246460667. The reversal of 21246460663 is 36606464212.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21246460663 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21246460667) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10623230331 + 10623230332.

It is an arithmetic number, because the mean of its divisors is an integer number (10623230332).

Almost surely, 2^21246460663 is an apocalyptic number.

21246460663 is a deficient number, since it is larger than the sum of its proper divisors (1).

21246460663 is an equidigital number, since it uses as much as digits as its factorization.

21246460663 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 248832, while the sum is 40.

The spelling of 21246460663 in words is "twenty-one billion, two hundred forty-six million, four hundred sixty thousand, six hundred sixty-three".