80000444021 has 2 divisors, whose sum is σ = 80000444022. Its totient is φ = 80000444020.

The previous prime is 80000443997. The next prime is 80000444047. The reversal of 80000444021 is 12044400008.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 74250255121 + 5750188900 = 272489^2 + 75830^2 .

It is a cyclic number.

It is not a de Polignac number, because 80000444021 - 2³⁴ = 62820574837 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (80000444081) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40000222010 + 40000222011.

It is an arithmetic number, because the mean of its divisors is an integer number (40000222011).

Almost surely, 2^80000444021 is an apocalyptic number.

It is an amenable number.

80000444021 is a deficient number, since it is larger than the sum of its proper divisors (1).

80000444021 is an equidigital number, since it uses as much as digits as its factorization.

80000444021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1024, while the sum is 23.

Adding to 80000444021 its reverse (12044400008), we get a palindrome (92044844029).

The spelling of 80000444021 in words is "eighty billion, four hundred forty-four thousand, twenty-one".