2131443321 has 16 divisors (see below), whose sum is σ = 3248560128. Its totient is φ = 1217725200.

The previous prime is 2131443227. The next prime is 2131443341. The reversal of 2131443321 is 1233441312.

It is a happy number.

It is not a de Polignac number, because 2131443321 - 2¹⁸ = 2131181177 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 2131443291 and 2131443300.

It is not an unprimeable number, because it can be changed into a prime (2131443341) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 191376 + ... + 202206.

It is an arithmetic number, because the mean of its divisors is an integer number (203035008).

Almost surely, 2^2131443321 is an apocalyptic number.

2131443321 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

2131443321 is a deficient number, since it is larger than the sum of its proper divisors (1117116807).

2131443321 is a wasteful number, since it uses less digits than its factorization.

2131443321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20212.

The product of its digits is 1728, while the sum is 24.

The square root of 2131443321 is about 46167.5570178887. The cubic root of 2131443321 is about 1286.9389032250.

Adding to 2131443321 its reverse (1233441312), we get a palindrome (3364884633).

The spelling of 2131443321 in words is "two billion, one hundred thirty-one million, four hundred forty-three thousand, three hundred twenty-one".