4021444420393 has 2 divisors, whose sum is σ = 4021444420394. Its totient is φ = 4021444420392.

The previous prime is 4021444420379. The next prime is 4021444420403. The reversal of 4021444420393 is 3930244441204.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 3616964956224 + 404479464169 = 1901832^2 + 635987^2 .

It is a cyclic number.

It is not a de Polignac number, because 4021444420393 - 2²⁵ = 4021410865961 is a prime.

It is not a weakly prime, because it can be changed into another prime (4021444420303) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2010722210196 + 2010722210197.

It is an arithmetic number, because the mean of its divisors is an integer number (2010722210197).

Almost surely, 2^{4021444420393} is an apocalyptic number.

It is an amenable number.

4021444420393 is a deficient number, since it is larger than the sum of its proper divisors (1).

4021444420393 is an equidigital number, since it uses as much as digits as its factorization.

4021444420393 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 331776, while the sum is 40.

Adding to 4021444420393 its reverse (3930244441204), we get a palindrome (7951688861597).

The spelling of 4021444420393 in words is "four trillion, twenty-one billion, four hundred forty-four million, four hundred twenty thousand, three hundred ninety-three".