2143120321 has 2 divisors, whose sum is σ = 2143120322. Its totient is φ = 2143120320.

The previous prime is 2143120277. The next prime is 2143120361. The reversal of 2143120321 is 1230213412.

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., 2044396225 + 98724096 = 45215^2 + 9936^2 .

It is a cyclic number.

It is not a de Polignac number, because 2143120321 - 2¹⁵ = 2143087553 is a prime.

It is not a weakly prime, because it can be changed into another prime (2143120361) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1071560160 + 1071560161.

It is an arithmetic number, because the mean of its divisors is an integer number (1071560161).

Almost surely, 2^2143120321 is an apocalyptic number.

It is an amenable number.

2143120321 is a deficient number, since it is larger than the sum of its proper divisors (1).

2143120321 is an equidigital number, since it uses as much as digits as its factorization.

2143120321 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 288, while the sum is 19.

The square root of 2143120321 is about 46293.8475501875. The cubic root of 2143120321 is about 1289.2847668679.

Adding to 2143120321 its reverse (1230213412), we get a palindrome (3373333733).

The spelling of 2143120321 in words is "two billion, one hundred forty-three million, one hundred twenty thousand, three hundred twenty-one".