220303001221 has 4 divisors (see below), whose sum is σ = 220370644332. Its totient is φ = 220235358112.

The previous prime is 220303001203. The next prime is 220303001231. The reversal of 220303001221 is 122100303022.

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 208533789025 + 11769212196 = 456655^2 + 108486^2 .

It is a cyclic number.

It is not a de Polignac number, because 220303001221 - 2⁵ = 220303001189 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 220303001195 and 220303001204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (220303001231) 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, 33816670 + ... + 33823183.

It is an arithmetic number, because the mean of its divisors is an integer number (55092661083).

Almost surely, 2^220303001221 is an apocalyptic number.

It is an amenable number.

220303001221 is a deficient number, since it is larger than the sum of its proper divisors (67643111).

220303001221 is an equidigital number, since it uses as much as digits as its factorization.

220303001221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 67643110.

The product of its (nonzero) digits is 144, while the sum is 16.

Adding to 220303001221 its reverse (122100303022), we get a palindrome (342403304243).

The spelling of 220303001221 in words is "two hundred twenty billion, three hundred three million, one thousand, two hundred twenty-one".