2121304431 has 4 divisors (see below), whose sum is σ = 2828405912. Its totient is φ = 1414202952.

The previous prime is 2121304403. The next prime is 2121304469. The reversal of 2121304431 is 1344031212.

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

It is not a de Polignac number, because 2121304431 - 2¹³ = 2121296239 is a prime.

It is a super-2 number, since 2×2121304431² = 8999864977960467522, 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 = 2121304398 and 2121304407.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2121304531) 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, 353550736 + ... + 353550741.

It is an arithmetic number, because the mean of its divisors is an integer number (707101478).

Almost surely, 2^2121304431 is an apocalyptic number.

2121304431 is a deficient number, since it is larger than the sum of its proper divisors (707101481).

2121304431 is an equidigital number, since it uses as much as digits as its factorization.

2121304431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 707101480.

The product of its (nonzero) digits is 576, while the sum is 21.

The square root of 2121304431 is about 46057.6207700745. The cubic root of 2121304431 is about 1284.8950806351.

Adding to 2121304431 its reverse (1344031212), we get a palindrome (3465335643).

The spelling of 2121304431 in words is "two billion, one hundred twenty-one million, three hundred four thousand, four hundred thirty-one".