21334224331 has 4 divisors (see below), whose sum is σ = 24381970672. Its totient is φ = 18286477992.

The previous prime is 21334224323. The next prime is 21334224337. The reversal of 21334224331 is 13342243312.

It is a happy number.

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 21334224331 - 2³ = 21334224323 is a prime.

It is a super-2 number, since 2×21334224331² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21334224331.

It is not an unprimeable number, because it can be changed into a prime (21334224337) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1523873160 + ... + 1523873173.

It is an arithmetic number, because the mean of its divisors is an integer number (6095492668).

Almost surely, 2^21334224331 is an apocalyptic number.

21334224331 is a deficient number, since it is larger than the sum of its proper divisors (3047746341).

21334224331 is an equidigital number, since it uses as much as digits as its factorization.

21334224331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3047746340.

The product of its digits is 10368, while the sum is 28.

Adding to 21334224331 its reverse (13342243312), we get a palindrome (34676467643).

It can be divided in two parts, 2 and 1334224331, that multiplied together give a palindrome (2668448662).

The spelling of 21334224331 in words is "twenty-one billion, three hundred thirty-four million, two hundred twenty-four thousand, three hundred thirty-one".