4144421043991 has 2 divisors, whose sum is σ = 4144421043992. Its totient is φ = 4144421043990.

The previous prime is 4144421043947. The next prime is 4144421044033. The reversal of 4144421043991 is 1993401244414.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 4144421043991 - 2¹⁹ = 4144420519703 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (4144421049991) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2072210521995 + 2072210521996.

It is an arithmetic number, because the mean of its divisors is an integer number (2072210521996).

Almost surely, 2^{4144421043991} is an apocalyptic number.

4144421043991 is a deficient number, since it is larger than the sum of its proper divisors (1).

4144421043991 is an equidigital number, since it uses as much as digits as its factorization.

4144421043991 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 497664, while the sum is 46.

The spelling of 4144421043991 in words is "four trillion, one hundred forty-four billion, four hundred twenty-one million, forty-three thousand, nine hundred ninety-one".