2220201221 has 6 divisors (see below), whose sum is σ = 2582683110. Its totient is φ = 1903029576.

The previous prime is 2220201187. The next prime is 2220201223. The reversal of 2220201221 is 1221020222.

It can be written as a sum of positive squares in only one way, i.e., 2196328225 + 23872996 = 46865^2 + 4886^2 .

It is not a de Polignac number, because 2220201221 - 2¹⁰ = 2220200197 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2220201196 and 2220201205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2220201223) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 22655066 + ... + 22655163.

It is an arithmetic number, because the mean of its divisors is an integer number (430447185).

Almost surely, 2^2220201221 is an apocalyptic number.

It is an amenable number.

2220201221 is a deficient number, since it is larger than the sum of its proper divisors (362481889).

2220201221 is an equidigital number, since it uses as much as digits as its factorization.

2220201221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45310243 (or 45310236 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 14.

The square root of 2220201221 is about 47119.0112481151. The cubic root of 2220201221 is about 1304.5601627891.

Adding to 2220201221 its reverse (1221020222), we get a palindrome (3441221443).

The spelling of 2220201221 in words is "two billion, two hundred twenty million, two hundred one thousand, two hundred twenty-one".