80921 has 4 divisors (see below), whose sum is σ = 85200. Its totient is φ = 76644.

The previous prime is 80917. The next prime is 80923. The reversal of 80921 is 12908.

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 80921 - 2² = 80917 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 80893 and 80902.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 80921.

It is not an unprimeable number, because it can be changed into a prime (80923) 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, 2111 + ... + 2148.

It is an arithmetic number, because the mean of its divisors is an integer number (21300).

2⁸⁰⁹²¹ is an apocalyptic number.

It is an amenable number.

80921 is a deficient number, since it is larger than the sum of its proper divisors (4279).

80921 is a wasteful number, since it uses less digits than its factorization.

80921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4278.

The product of its (nonzero) digits is 144, while the sum is 20.

The square root of 80921 is about 284.4661667053. The cubic root of 80921 is about 43.2534161490.

It can be divided in two parts, 80 and 921, that added together give a palindrome (1001).

The spelling of 80921 in words is "eighty thousand, nine hundred twenty-one".