80842821 has 4 divisors (see below), whose sum is σ = 107790432. Its totient is φ = 53895212.

The previous prime is 80842819. The next prime is 80842831. The reversal of 80842821 is 12824808.

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 80842821 - 2¹ = 80842819 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (80842831) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13473801 + ... + 13473806.

It is an arithmetic number, because the mean of its divisors is an integer number (26947608).

Almost surely, 2^80842821 is an apocalyptic number.

It is an amenable number.

80842821 is a deficient number, since it is larger than the sum of its proper divisors (26947611).

80842821 is a wasteful number, since it uses less digits than its factorization.

80842821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26947610.

The product of its (nonzero) digits is 8192, while the sum is 33.

The square root of 80842821 is about 8991.2635930663. The cubic root of 80842821 is about 432.3948240137.

The spelling of 80842821 in words is "eighty million, eight hundred forty-two thousand, eight hundred twenty-one".