220106321 has 4 divisors (see below), whose sum is σ = 220139172. Its totient is φ = 220073472.

The previous prime is 220106309. The next prime is 220106329. The reversal of 220106321 is 123601022.

220106321 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 135466321 + 84640000 = 11639^2 + 9200^2 .

It is a cyclic number.

It is not a de Polignac number, because 220106321 - 2¹⁴ = 220089937 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 220106321.

It is not an unprimeable number, because it can be changed into a prime (220106329) 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, 2360 + ... + 21113.

It is an arithmetic number, because the mean of its divisors is an integer number (55034793).

Almost surely, 2^220106321 is an apocalyptic number.

It is an amenable number.

220106321 is a deficient number, since it is larger than the sum of its proper divisors (32851).

220106321 is an equidigital number, since it uses as much as digits as its factorization.

220106321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32850.

The product of its (nonzero) digits is 144, while the sum is 17.

The square root of 220106321 is about 14835.9806214487. The cubic root of 220106321 is about 603.7783064656.

Adding to 220106321 its reverse (123601022), we get a palindrome (343707343).

The spelling of 220106321 in words is "two hundred twenty million, one hundred six thousand, three hundred twenty-one".