2231231321 has 4 divisors (see below), whose sum is σ = 2434070544. Its totient is φ = 2028392100.

The previous prime is 2231231309. The next prime is 2231231339. The reversal of 2231231321 is 1231321322.

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 a de Polignac number, because none of the positive numbers 2^k-2231231321 is a prime.

It is a super-3 number, since 3×2231231321³ (a number of 29 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2231231293 and 2231231302.

It is not an unprimeable number, because it can be changed into a prime (2231231371) 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, 101419595 + ... + 101419616.

It is an arithmetic number, because the mean of its divisors is an integer number (608517636).

Almost surely, 2^2231231321 is an apocalyptic number.

It is an amenable number.

2231231321 is a deficient number, since it is larger than the sum of its proper divisors (202839223).

2231231321 is a wasteful number, since it uses less digits than its factorization.

2231231321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 202839222.

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

The square root of 2231231321 is about 47235.9113493113. The cubic root of 2231231321 is about 1306.7169741133.

Adding to 2231231321 its reverse (1231321322), we get a palindrome (3462552643).

Subtracting from 2231231321 its reverse (1231321322), we obtain a palindrome (999909999).

The spelling of 2231231321 in words is "two billion, two hundred thirty-one million, two hundred thirty-one thousand, three hundred twenty-one".