2221031221 has 4 divisors (see below), whose sum is σ = 2221666252. Its totient is φ = 2220396192.

The previous prime is 2221031203. The next prime is 2221031231. The reversal of 2221031221 is 1221301222.

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 1351371121 + 869660100 = 36761^2 + 29490^2 .

It is a cyclic number.

It is not a de Polignac number, because 2221031221 - 2²⁷ = 2086813493 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2221031195 and 2221031204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2221031231) 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, 312240 + ... + 319273.

It is an arithmetic number, because the mean of its divisors is an integer number (555416563).

Almost surely, 2^2221031221 is an apocalyptic number.

It is an amenable number.

2221031221 is a deficient number, since it is larger than the sum of its proper divisors (635031).

2221031221 is an equidigital number, since it uses as much as digits as its factorization.

2221031221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 635030.

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

The square root of 2221031221 is about 47127.8179104444. The cubic root of 2221031221 is about 1304.7227081211.

Adding to 2221031221 its reverse (1221301222), we get a palindrome (3442332443).

The spelling of 2221031221 in words is "two billion, two hundred twenty-one million, thirty-one thousand, two hundred twenty-one".