80320021 has 2 divisors, whose sum is σ = 80320022. Its totient is φ = 80320020.

The previous prime is 80320003. The next prime is 80320033. The reversal of 80320021 is 12002308.

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., 68657796 + 11662225 = 8286^2 + 3415^2 .

It is a cyclic number.

It is not a de Polignac number, because 80320021 - 2¹⁵ = 80287253 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 80319977 and 80320004.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (80320421) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40160010 + 40160011.

It is an arithmetic number, because the mean of its divisors is an integer number (40160011).

Almost surely, 2^80320021 is an apocalyptic number.

It is an amenable number.

80320021 is a deficient number, since it is larger than the sum of its proper divisors (1).

80320021 is an equidigital number, since it uses as much as digits as its factorization.

80320021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 96, while the sum is 16.

The square root of 80320021 is about 8962.1437725580. The cubic root of 80320021 is about 431.4607272026.

Adding to 80320021 its reverse (12002308), we get a palindrome (92322329).

The spelling of 80320021 in words is "eighty million, three hundred twenty thousand, twenty-one".