1002221321 has 2 divisors, whose sum is σ = 1002221322. Its totient is φ = 1002221320.

The previous prime is 1002221317. The next prime is 1002221323. The reversal of 1002221321 is 1231222001.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 872375296 + 129846025 = 29536^2 + 11395^2 .

It is an emirp because it is prime and its reverse (1231222001) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1002221321 - 2² = 1002221317 is a prime.

Together with 1002221323, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 1002221296 and 1002221305.

It is not a weakly prime, because it can be changed into another prime (1002221323) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 501110660 + 501110661.

It is an arithmetic number, because the mean of its divisors is an integer number (501110661).

Almost surely, 2^1002221321 is an apocalyptic number.

It is an amenable number.

1002221321 is a deficient number, since it is larger than the sum of its proper divisors (1).

1002221321 is an equidigital number, since it uses as much as digits as its factorization.

1002221321 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 48, while the sum is 14.

The square root of 1002221321 is about 31657.8792877855. The cubic root of 1002221321 is about 1000.7398927570.

Adding to 1002221321 its reverse (1231222001), we get a palindrome (2233443322).

The spelling of 1002221321 in words is "one billion, two million, two hundred twenty-one thousand, three hundred twenty-one".