80015021 has 2 divisors, whose sum is σ = 80015022. Its totient is φ = 80015020.

The previous prime is 80015017. The next prime is 80015027. The reversal of 80015021 is 12051008.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 76825225 + 3189796 = 8765^2 + 1786^2 .

It is a cyclic number.

It is not a de Polignac number, because 80015021 - 2² = 80015017 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (80015027) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40007510 + 40007511.

It is an arithmetic number, because the mean of its divisors is an integer number (40007511).

Almost surely, 2^80015021 is an apocalyptic number.

It is an amenable number.

80015021 is a deficient number, since it is larger than the sum of its proper divisors (1).

80015021 is an equidigital number, since it uses as much as digits as its factorization.

80015021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 80, while the sum is 17.

The square root of 80015021 is about 8945.1115700141. Note that the first 3 decimals coincide. The cubic root of 80015021 is about 430.9139044549.

Adding to 80015021 its reverse (12051008), we get a palindrome (92066029).

The spelling of 80015021 in words is "eighty million, fifteen thousand, twenty-one".