321220055 has 8 divisors (see below), whose sum is σ = 415115232. Its totient is φ = 237208608.

The previous prime is 321220033. The next prime is 321220073. The reversal of 321220055 is 550022123.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 321220055 - 2¹² = 321215959 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2470859 + ... + 2470988.

It is an arithmetic number, because the mean of its divisors is an integer number (51889404).

Almost surely, 2^321220055 is an apocalyptic number.

321220055 is a deficient number, since it is larger than the sum of its proper divisors (93895177).

321220055 is a wasteful number, since it uses less digits than its factorization.

321220055 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4941865.

The product of its (nonzero) digits is 600, while the sum is 20.

The square root of 321220055 is about 17922.6129512412. The cubic root of 321220055 is about 684.8585532087.

Adding to 321220055 its reverse (550022123), we get a palindrome (871242178).

The spelling of 321220055 in words is "three hundred twenty-one million, two hundred twenty thousand, fifty-five".