801221 has 4 divisors (see below), whose sum is σ = 803244. Its totient is φ = 799200.

The previous prime is 801217. The next prime is 801247. The reversal of 801221 is 122108.

801221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 330625 + 470596 = 575^2 + 686^2 .

It is a cyclic number.

It is not a de Polignac number, because 801221 - 2² = 801217 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 801196 and 801205.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 801221.

It is not an unprimeable number, because it can be changed into a prime (801421) 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, 200 + ... + 1281.

It is an arithmetic number, because the mean of its divisors is an integer number (200811).

2⁸⁰¹²²¹ is an apocalyptic number.

It is an amenable number.

801221 is a deficient number, since it is larger than the sum of its proper divisors (2023).

801221 is a wasteful number, since it uses less digits than its factorization.

801221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2022.

The product of its (nonzero) digits is 32, while the sum is 14.

The square root of 801221 is about 895.1094905094. The cubic root of 801221 is about 92.8789808317.

Adding to 801221 its reverse (122108), we get a palindrome (923329).

The spelling of 801221 in words is "eight hundred one thousand, two hundred twenty-one".