2133121231 has 4 divisors (see below), whose sum is σ = 2163165264. Its totient is φ = 2103077200.

The previous prime is 2133121219. The next prime is 2133121259. The reversal of 2133121231 is 1321213312.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 2133121231 - 2⁷ = 2133121103 is a prime.

It is a super-2 number, since 2×2133121231² = 9100412372285910722, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2133121199 and 2133121208.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2133121271) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15021910 + ... + 15022051.

It is an arithmetic number, because the mean of its divisors is an integer number (540791316).

Almost surely, 2^2133121231 is an apocalyptic number.

2133121231 is a deficient number, since it is larger than the sum of its proper divisors (30044033).

2133121231 is an equidigital number, since it uses as much as digits as its factorization.

2133121231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30044032.

The product of its digits is 216, while the sum is 19.

The square root of 2133121231 is about 46185.7254029857. The cubic root of 2133121231 is about 1287.2765150287.

Adding to 2133121231 its reverse (1321213312), we get a palindrome (3454334543).

The spelling of 2133121231 in words is "two billion, one hundred thirty-three million, one hundred twenty-one thousand, two hundred thirty-one".