321220441 has 4 divisors (see below), whose sum is σ = 338126800. Its totient is φ = 304314084.

The previous prime is 321220433. The next prime is 321220477. The reversal of 321220441 is 144022123.

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 321220441 - 2³ = 321220433 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (19), and also a Moran number because the ratio is a prime number: 16906339 = 321220441 / (3 + 2 + 1 + 2 + 2 + 0 + 4 + 4 + 1).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (321221441) 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, 8453151 + ... + 8453188.

It is an arithmetic number, because the mean of its divisors is an integer number (84531700).

Almost surely, 2^321220441 is an apocalyptic number.

It is an amenable number.

321220441 is a deficient number, since it is larger than the sum of its proper divisors (16906359).

321220441 is a wasteful number, since it uses less digits than its factorization.

321220441 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16906358.

The product of its (nonzero) digits is 384, while the sum is 19.

The square root of 321220441 is about 17922.6237197571. The cubic root of 321220441 is about 684.8588275329.

Adding to 321220441 its reverse (144022123), we get a palindrome (465242564).

It can be divided in two parts, 3212 and 20441, that added together give a triangular number (23653 = T₂₁₇).

The spelling of 321220441 in words is "three hundred twenty-one million, two hundred twenty thousand, four hundred forty-one".