2131221323 has 32 divisors (see below), whose sum is σ = 2698375680. Its totient is φ = 1635068160.

The previous prime is 2131221283. The next prime is 2131221359. The reversal of 2131221323 is 3231221312.

It is not a de Polignac number, because 2131221323 - 2⁶ = 2131221259 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2131221295 and 2131221304.

It is not an unprimeable number, because it can be changed into a prime (2131221373) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2103365 + ... + 2104377.

It is an arithmetic number, because the mean of its divisors is an integer number (84324240).

Almost surely, 2^2131221323 is an apocalyptic number.

2131221323 is a deficient number, since it is larger than the sum of its proper divisors (567154357).

2131221323 is a wasteful number, since it uses less digits than its factorization.

2131221323 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1427.

The product of its digits is 432, while the sum is 20.

The square root of 2131221323 is about 46165.1526911804. The cubic root of 2131221323 is about 1286.8942217989.

Adding to 2131221323 its reverse (3231221312), we get a palindrome (5362442635).

The spelling of 2131221323 in words is "two billion, one hundred thirty-one million, two hundred twenty-one thousand, three hundred twenty-three".