2220311221 has 4 divisors (see below), whose sum is σ = 2226264172. Its totient is φ = 2214358272.

The previous prime is 2220311209. The next prime is 2220311273. The reversal of 2220311221 is 1221130222.

It is a happy number.

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 1163151025 + 1057160196 = 34105^2 + 32514^2 .

It is a cyclic number.

It is not a de Polignac number, because 2220311221 - 2¹¹ = 2220309173 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2220311195 and 2220311204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2220311201) 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, 2975916 + ... + 2976661.

It is an arithmetic number, because the mean of its divisors is an integer number (556566043).

Almost surely, 2^2220311221 is an apocalyptic number.

It is an amenable number.

2220311221 is a deficient number, since it is larger than the sum of its proper divisors (5952951).

2220311221 is an equidigital number, since it uses as much as digits as its factorization.

2220311221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5952950.

The product of its (nonzero) digits is 96, while the sum is 16.

The square root of 2220311221 is about 47120.1784907485. The cubic root of 2220311221 is about 1304.5817072700.

Adding to 2220311221 its reverse (1221130222), we get a palindrome (3441441443).

The spelling of 2220311221 in words is "two billion, two hundred twenty million, three hundred eleven thousand, two hundred twenty-one".