80021281 has 2 divisors, whose sum is σ = 80021282. Its totient is φ = 80021280.

The previous prime is 80021257. The next prime is 80021297. The reversal of 80021281 is 18212008.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 74304400 + 5716881 = 8620^2 + 2391^2 .

It is a cyclic number.

It is not a de Polignac number, because 80021281 - 2⁷ = 80021153 is a prime.

It is a super-2 number, since 2×80021281² = 12806810825761922, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (80021251) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40010640 + 40010641.

It is an arithmetic number, because the mean of its divisors is an integer number (40010641).

Almost surely, 2^80021281 is an apocalyptic number.

It is an amenable number.

80021281 is a deficient number, since it is larger than the sum of its proper divisors (1).

80021281 is an equidigital number, since it uses as much as digits as its factorization.

80021281 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 256, while the sum is 22.

The square root of 80021281 is about 8945.4614749604. The cubic root of 80021281 is about 430.9251417229.

Adding to 80021281 its reverse (18212008), we get a palindrome (98233289).

The spelling of 80021281 in words is "eighty million, twenty-one thousand, two hundred eighty-one".