2221201221 has 16 divisors (see below), whose sum is σ = 3023588736. Its totient is φ = 1449920576.

The previous prime is 2221201211. The next prime is 2221201253. The reversal of 2221201221 is 1221021222.

It is not a de Polignac number, because 2221201221 - 2⁷ = 2221201093 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 2221201221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2221201211) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 66091 + ... + 93863.

It is an arithmetic number, because the mean of its divisors is an integer number (188974296).

Almost surely, 2^2221201221 is an apocalyptic number.

It is an amenable number.

2221201221 is a deficient number, since it is larger than the sum of its proper divisors (802387515).

2221201221 is a wasteful number, since it uses less digits than its factorization.

2221201221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28332.

The product of its (nonzero) digits is 64, while the sum is 15.

The square root of 2221201221 is about 47129.6214816118. The cubic root of 2221201221 is about 1304.7559955418.

Adding to 2221201221 its reverse (1221021222), we get a palindrome (3442222443).

The spelling of 2221201221 in words is "two billion, two hundred twenty-one million, two hundred one thousand, two hundred twenty-one".