2231201321 has 2 divisors, whose sum is σ = 2231201322. Its totient is φ = 2231201320.

The previous prime is 2231201309. The next prime is 2231201339. The reversal of 2231201321 is 1231021322.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1564993600 + 666207721 = 39560^2 + 25811^2 .

It is a cyclic number.

It is not a de Polignac number, because 2231201321 - 2²² = 2227007017 is a prime.

It is a super-3 number, since 3×2231201321³ (a number of 29 digits) contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 2231201321.

It is not a weakly prime, because it can be changed into another prime (2231203321) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1115600660 + 1115600661.

It is an arithmetic number, because the mean of its divisors is an integer number (1115600661).

Almost surely, 2^2231201321 is an apocalyptic number.

It is an amenable number.

2231201321 is a deficient number, since it is larger than the sum of its proper divisors (1).

2231201321 is an equidigital number, since it uses as much as digits as its factorization.

2231201321 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 144, while the sum is 17.

The square root of 2231201321 is about 47235.5937932403. The cubic root of 2231201321 is about 1306.7111176034.

Adding to 2231201321 its reverse (1231021322), we get a palindrome (3462222643).

The spelling of 2231201321 in words is "two billion, two hundred thirty-one million, two hundred one thousand, three hundred twenty-one".