321220111221606 has 64 divisors (see below), whose sum is σ = 659286941241600. Its totient is φ = 104294788880256.

The previous prime is 321220111221557. The next prime is 321220111221641. The reversal of 321220111221606 is 606122111022123.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2816008185 + ... + 2816122251.

It is an arithmetic number, because the mean of its divisors is an integer number (10301358456900).

Almost surely, 2^{321220111221606} is an apocalyptic number.

321220111221606 is an abundant number, since it is smaller than the sum of its proper divisors (338066830019994).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

321220111221606 is a wasteful number, since it uses less digits than its factorization.

321220111221606 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 177973.

The product of its (nonzero) digits is 3456, while the sum is 30.

Adding to 321220111221606 its reverse (606122111022123), we get a palindrome (927342222243729).

The spelling of 321220111221606 in words is "three hundred twenty-one trillion, two hundred twenty billion, one hundred eleven million, two hundred twenty-one thousand, six hundred six".