444221213021 has 2 divisors, whose sum is σ = 444221213022. Its totient is φ = 444221213020.

The previous prime is 444221212999. The next prime is 444221213083. The reversal of 444221213021 is 120312122444.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 413153272900 + 31067940121 = 642770^2 + 176261^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-444221213021 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (444221213221) 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, 222110606510 + 222110606511.

It is an arithmetic number, because the mean of its divisors is an integer number (222110606511).

Almost surely, 2^444221213021 is an apocalyptic number.

It is an amenable number.

444221213021 is a deficient number, since it is larger than the sum of its proper divisors (1).

444221213021 is an equidigital number, since it uses as much as digits as its factorization.

444221213021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3072, while the sum is 26.

Adding to 444221213021 its reverse (120312122444), we get a palindrome (564533335465).

The spelling of 444221213021 in words is "four hundred forty-four billion, two hundred twenty-one million, two hundred thirteen thousand, twenty-one".