21746812963 has 2 divisors, whose sum is σ = 21746812964. Its totient is φ = 21746812962.

The previous prime is 21746812949. The next prime is 21746813017. The reversal of 21746812963 is 36921864712.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21746812963 is a prime.

It is not a weakly prime, because it can be changed into another prime (21746012963) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10873406481 + 10873406482.

It is an arithmetic number, because the mean of its divisors is an integer number (10873406482).

Almost surely, 2^21746812963 is an apocalyptic number.

21746812963 is a deficient number, since it is larger than the sum of its proper divisors (1).

21746812963 is an equidigital number, since it uses as much as digits as its factorization.

21746812963 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 870912, while the sum is 49.

The spelling of 21746812963 in words is "twenty-one billion, seven hundred forty-six million, eight hundred twelve thousand, nine hundred sixty-three".