321040221 has 16 divisors (see below), whose sum is σ = 441686784. Its totient is φ = 207304704.

The previous prime is 321040219. The next prime is 321040241. The reversal of 321040221 is 122040123.

It is not a de Polignac number, because 321040221 - 2¹ = 321040219 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 321040221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (321040211) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1941 + ... + 25413.

It is an arithmetic number, because the mean of its divisors is an integer number (27605424).

Almost surely, 2^321040221 is an apocalyptic number.

It is an amenable number.

321040221 is a deficient number, since it is larger than the sum of its proper divisors (120646563).

321040221 is a wasteful number, since it uses less digits than its factorization.

321040221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23620.

The product of its (nonzero) digits is 96, while the sum is 15.

The square root of 321040221 is about 17917.5952906633. The cubic root of 321040221 is about 684.7307240751.

Adding to 321040221 its reverse (122040123), we get a palindrome (443080344).

The spelling of 321040221 in words is "three hundred twenty-one million, forty thousand, two hundred twenty-one".