21199968443 has 2 divisors, whose sum is σ = 21199968444. Its totient is φ = 21199968442.

The previous prime is 21199968421. The next prime is 21199968451. The reversal of 21199968443 is 34486999112.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21199968443 - 2⁸ = 21199968187 is a prime.

It is not a weakly prime, because it can be changed into another prime (21199968463) 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, 10599984221 + 10599984222.

It is an arithmetic number, because the mean of its divisors is an integer number (10599984222).

Almost surely, 2^21199968443 is an apocalyptic number.

21199968443 is a deficient number, since it is larger than the sum of its proper divisors (1).

21199968443 is an equidigital number, since it uses as much as digits as its factorization.

21199968443 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3359232, while the sum is 56.

The spelling of 21199968443 in words is "twenty-one billion, one hundred ninety-nine million, nine hundred sixty-eight thousand, four hundred forty-three".