21444004193 has 2 divisors, whose sum is σ = 21444004194. Its totient is φ = 21444004192.

The previous prime is 21444004177. The next prime is 21444004261. The reversal of 21444004193 is 39140044412.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19095923344 + 2348080849 = 138188^2 + 48457^2 .

It is a cyclic number.

It is not a de Polignac number, because 21444004193 - 2⁴ = 21444004177 is a prime.

It is not a weakly prime, because it can be changed into another prime (21444054193) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10722002096 + 10722002097.

It is an arithmetic number, because the mean of its divisors is an integer number (10722002097).

Almost surely, 2^21444004193 is an apocalyptic number.

It is an amenable number.

21444004193 is a deficient number, since it is larger than the sum of its proper divisors (1).

21444004193 is an equidigital number, since it uses as much as digits as its factorization.

21444004193 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 13824, while the sum is 32.

The spelling of 21444004193 in words is "twenty-one billion, four hundred forty-four million, four thousand, one hundred ninety-three".