2143121311 has 4 divisors (see below), whose sum is σ = 2148717312. Its totient is φ = 2137525312.

The previous prime is 2143121287. The next prime is 2143121341. The reversal of 2143121311 is 1131213412.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 2143121311 - 2¹⁵ = 2143088543 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2143121341) 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, 2797426 + ... + 2798191.

It is an arithmetic number, because the mean of its divisors is an integer number (537179328).

Almost surely, 2^2143121311 is an apocalyptic number.

2143121311 is a deficient number, since it is larger than the sum of its proper divisors (5596001).

2143121311 is an equidigital number, since it uses as much as digits as its factorization.

2143121311 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5596000.

The product of its digits is 144, while the sum is 19.

The square root of 2143121311 is about 46293.8582427518. The cubic root of 2143121311 is about 1289.2849653934.

Adding to 2143121311 its reverse (1131213412), we get a palindrome (3274334723).

The spelling of 2143121311 in words is "two billion, one hundred forty-three million, one hundred twenty-one thousand, three hundred eleven".