2211221321 has 4 divisors (see below), whose sum is σ = 2252942532. Its totient is φ = 2169500112.

The previous prime is 2211221317. The next prime is 2211221339. The reversal of 2211221321 is 1231221122.

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 557904400 + 1653316921 = 23620^2 + 40661^2 .

It is a cyclic number.

It is not a de Polignac number, because 2211221321 - 2² = 2211221317 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 2211221321.

It is not an unprimeable number, because it can be changed into a prime (2211223321) 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, 20860526 + ... + 20860631.

It is an arithmetic number, because the mean of its divisors is an integer number (563235633).

Almost surely, 2^2211221321 is an apocalyptic number.

It is an amenable number.

2211221321 is a deficient number, since it is larger than the sum of its proper divisors (41721211).

2211221321 is an equidigital number, since it uses as much as digits as its factorization.

2211221321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41721210.

The product of its digits is 96, while the sum is 17.

The square root of 2211221321 is about 47023.6251367331. The cubic root of 2211221321 is about 1302.7989636493.

Adding to 2211221321 its reverse (1231221122), we get a palindrome (3442442443).

The spelling of 2211221321 in words is "two billion, two hundred eleven million, two hundred twenty-one thousand, three hundred twenty-one".