2121323231 has 8 divisors (see below), whose sum is σ = 2181092928. Its totient is φ = 2061936000.

The previous prime is 2121323221. The next prime is 2121323287. The reversal of 2121323231 is 1323231212.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 2121323231 - 2¹⁰ = 2121322207 is a prime.

It is a super-2 number, since 2×2121323231² = 9000024500760558722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2121323201) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 84350 + ... + 106571.

It is an arithmetic number, because the mean of its divisors is an integer number (272636616).

Almost surely, 2^2121323231 is an apocalyptic number.

2121323231 is a deficient number, since it is larger than the sum of its proper divisors (59769697).

2121323231 is a wasteful number, since it uses less digits than its factorization.

2121323231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 191233.

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

The square root of 2121323231 is about 46057.8248617974. The cubic root of 2121323231 is about 1284.8988764059.

Adding to 2121323231 its reverse (1323231212), we get a palindrome (3444554443).

It can be divided in two parts, 21213 and 23231, that added together give a palindrome (44444).

The spelling of 2121323231 in words is "two billion, one hundred twenty-one million, three hundred twenty-three thousand, two hundred thirty-one".