2121433321 has 4 divisors (see below), whose sum is σ = 2424495232. Its totient is φ = 1818371412.

The previous prime is 2121433291. The next prime is 2121433333. The reversal of 2121433321 is 1233341212.

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 2121433321 - 2⁹ = 2121432809 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2121433292 and 2121433301.

It is not an unprimeable number, because it can be changed into a prime (2121433121) 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, 151530945 + ... + 151530958.

It is an arithmetic number, because the mean of its divisors is an integer number (606123808).

Almost surely, 2^2121433321 is an apocalyptic number.

It is an amenable number.

2121433321 is a deficient number, since it is larger than the sum of its proper divisors (303061911).

2121433321 is an equidigital number, since it uses as much as digits as its factorization.

2121433321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 303061910.

The product of its digits is 864, while the sum is 22.

The square root of 2121433321 is about 46059.0199743764. The cubic root of 2121433321 is about 1284.9211034241.

Adding to 2121433321 its reverse (1233341212), we get a palindrome (3354774533).

The spelling of 2121433321 in words is "two billion, one hundred twenty-one million, four hundred thirty-three thousand, three hundred twenty-one".