144421321991 has 2 divisors, whose sum is σ = 144421321992. Its totient is φ = 144421321990.

The previous prime is 144421321949. The next prime is 144421322039. The reversal of 144421321991 is 199123124441.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-144421321991 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (144421321391) 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, 72210660995 + 72210660996.

It is an arithmetic number, because the mean of its divisors is an integer number (72210660996).

Almost surely, 2^144421321991 is an apocalyptic number.

144421321991 is a deficient number, since it is larger than the sum of its proper divisors (1).

144421321991 is an equidigital number, since it uses as much as digits as its factorization.

144421321991 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 62208, while the sum is 41.

The spelling of 144421321991 in words is "one hundred forty-four billion, four hundred twenty-one million, three hundred twenty-one thousand, nine hundred ninety-one".