80440021 has 2 divisors, whose sum is σ = 80440022. Its totient is φ = 80440020.

The previous prime is 80439973. The next prime is 80440027. The reversal of 80440021 is 12004408.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 45037521 + 35402500 = 6711^2 + 5950^2 .

It is a cyclic number.

It is not a de Polignac number, because 80440021 - 2⁷ = 80439893 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (80440027) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40220010 + 40220011.

It is an arithmetic number, because the mean of its divisors is an integer number (40220011).

Almost surely, 2^80440021 is an apocalyptic number.

It is an amenable number.

80440021 is a deficient number, since it is larger than the sum of its proper divisors (1).

80440021 is an equidigital number, since it uses as much as digits as its factorization.

80440021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 256, while the sum is 19.

The square root of 80440021 is about 8968.8361006320. The cubic root of 80440021 is about 431.6754911079.

Adding to 80440021 its reverse (12004408), we get a palindrome (92444429).

The spelling of 80440021 in words is "eighty million, four hundred forty thousand, twenty-one".