2143221345 has 24 divisors (see below), whose sum is σ = 3717628200. Its totient is φ = 1142217216.

The previous prime is 2143221343. The next prime is 2143221361. The reversal of 2143221345 is 5431223412.

It can be written as a sum of positive squares in 4 ways, for example, as 57289761 + 2085931584 = 7569^2 + 45672^2 .

It is not a de Polignac number, because 2143221345 - 2¹ = 2143221343 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (2143221343) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 47641 + ... + 80969.

It is an arithmetic number, because the mean of its divisors is an integer number (154901175).

Almost surely, 2^2143221345 is an apocalyptic number.

It is an amenable number.

2143221345 is a deficient number, since it is larger than the sum of its proper divisors (1574406855).

2143221345 is a wasteful number, since it uses less digits than its factorization.

2143221345 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34769 (or 34766 counting only the distinct ones).

The product of its digits is 5760, while the sum is 27.

The square root of 2143221345 is about 46294.9386542417. The cubic root of 2143221345 is about 1289.3050249711.

Adding to 2143221345 its reverse (5431223412), we get a palindrome (7574444757).

The spelling of 2143221345 in words is "two billion, one hundred forty-three million, two hundred twenty-one thousand, three hundred forty-five".