2131240321 has 4 divisors (see below), whose sum is σ = 2435703232. Its totient is φ = 1826777412.

The previous prime is 2131240291. The next prime is 2131240327. The reversal of 2131240321 is 1230421312.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 2131240321 - 2²⁹ = 1594369409 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2131240327) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 152231445 + ... + 152231458.

It is an arithmetic number, because the mean of its divisors is an integer number (608925808).

Almost surely, 2^2131240321 is an apocalyptic number.

It is an amenable number.

2131240321 is a deficient number, since it is larger than the sum of its proper divisors (304462911).

2131240321 is an equidigital number, since it uses as much as digits as its factorization.

2131240321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 304462910.

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

The square root of 2131240321 is about 46165.3584519822. The cubic root of 2131240321 is about 1286.8980456382.

Adding to 2131240321 its reverse (1230421312), we get a palindrome (3361661633).

The spelling of 2131240321 in words is "two billion, one hundred thirty-one million, two hundred forty thousand, three hundred twenty-one".