21516467443 has 2 divisors, whose sum is σ = 21516467444. Its totient is φ = 21516467442.

The previous prime is 21516467419. The next prime is 21516467461. The reversal of 21516467443 is 34476461512.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21516467443 - 2¹⁷ = 21516336371 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21516467443.

It is not a weakly prime, because it can be changed into another prime (21516467743) 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, 10758233721 + 10758233722.

It is an arithmetic number, because the mean of its divisors is an integer number (10758233722).

Almost surely, 2^21516467443 is an apocalyptic number.

21516467443 is a deficient number, since it is larger than the sum of its proper divisors (1).

21516467443 is an equidigital number, since it uses as much as digits as its factorization.

21516467443 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 483840, while the sum is 43.

The spelling of 21516467443 in words is "twenty-one billion, five hundred sixteen million, four hundred sixty-seven thousand, four hundred forty-three".