2123144321 has 4 divisors (see below), whose sum is σ = 2123236692. Its totient is φ = 2123051952.

The previous prime is 2123144291. The next prime is 2123144339. The reversal of 2123144321 is 1234413212.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 1103236225 + 1019908096 = 33215^2 + 31936^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2123144321 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2123144371) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18371 + ... + 67703.

It is an arithmetic number, because the mean of its divisors is an integer number (530809173).

Almost surely, 2^2123144321 is an apocalyptic number.

It is an amenable number.

2123144321 is a deficient number, since it is larger than the sum of its proper divisors (92371).

2123144321 is an equidigital number, since it uses as much as digits as its factorization.

2123144321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 92370.

The product of its digits is 1152, while the sum is 23.

The square root of 2123144321 is about 46077.5902256184. The cubic root of 2123144321 is about 1285.2664531457.

Adding to 2123144321 its reverse (1234413212), we get a palindrome (3357557533).

The spelling of 2123144321 in words is "two billion, one hundred twenty-three million, one hundred forty-four thousand, three hundred twenty-one".