80010821 has 4 divisors (see below), whose sum is σ = 87284544. Its totient is φ = 72737100.

The previous prime is 80010817. The next prime is 80010829. The reversal of 80010821 is 12801008.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 80010821 - 2² = 80010817 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 80010793 and 80010802.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (80010829) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3636845 + ... + 3636866.

It is an arithmetic number, because the mean of its divisors is an integer number (21821136).

Almost surely, 2^80010821 is an apocalyptic number.

It is an amenable number.

80010821 is a deficient number, since it is larger than the sum of its proper divisors (7273723).

80010821 is a wasteful number, since it uses less digits than its factorization.

80010821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7273722.

The product of its (nonzero) digits is 128, while the sum is 20.

The square root of 80010821 is about 8944.8768018347. The cubic root of 80010821 is about 430.9063647453.

Adding to 80010821 its reverse (12801008), we get a palindrome (92811829).

The spelling of 80010821 in words is "eighty million, ten thousand, eight hundred twenty-one".