220331312221 has 4 divisors (see below), whose sum is σ = 221039773344. Its totient is φ = 219622851100.

The previous prime is 220331312203. The next prime is 220331312231. The reversal of 220331312221 is 122213133022.

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 220331312221 - 2⁹ = 220331311709 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 220331312192 and 220331312201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (220331312231) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 354230095 + ... + 354230716.

It is an arithmetic number, because the mean of its divisors is an integer number (55259943336).

Almost surely, 2^220331312221 is an apocalyptic number.

It is an amenable number.

220331312221 is a deficient number, since it is larger than the sum of its proper divisors (708461123).

220331312221 is an equidigital number, since it uses as much as digits as its factorization.

220331312221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 708461122.

The product of its (nonzero) digits is 864, while the sum is 22.

Adding to 220331312221 its reverse (122213133022), we get a palindrome (342544445243).

The spelling of 220331312221 in words is "two hundred twenty billion, three hundred thirty-one million, three hundred twelve thousand, two hundred twenty-one".