2221313321 has 4 divisors (see below), whose sum is σ = 2221411200. Its totient is φ = 2221215444.

The previous prime is 2221313317. The next prime is 2221313323. The reversal of 2221313321 is 1233131222.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 1233131222 = 2 ⋅616565611.

It is a cyclic number.

It is not a de Polignac number, because 2221313321 - 2² = 2221313317 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2221313293 and 2221313302.

It is not an unprimeable number, because it can be changed into a prime (2221313323) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4700 + ... + 66818.

It is an arithmetic number, because the mean of its divisors is an integer number (555352800).

Almost surely, 2^2221313321 is an apocalyptic number.

It is an amenable number.

2221313321 is a deficient number, since it is larger than the sum of its proper divisors (97879).

2221313321 is an equidigital number, since it uses as much as digits as its factorization.

2221313321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 97878.

The product of its digits is 432, while the sum is 20.

The square root of 2221313321 is about 47130.8107398971. The cubic root of 2221313321 is about 1304.7779447293. Note that the first 3 decimals are identical.

Adding to 2221313321 its reverse (1233131222), we get a palindrome (3454444543).

The spelling of 2221313321 in words is "two billion, two hundred twenty-one million, three hundred thirteen thousand, three hundred twenty-one".