21244334321 has 32 divisors (see below), whose sum is σ = 25957662720. Its totient is φ = 16982784000.

The previous prime is 21244334299. The next prime is 21244334347. The reversal of 21244334321 is 12343344212.

It is not a de Polignac number, because 21244334321 - 2²⁶ = 21177225457 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (21244354321) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2207921 + ... + 2217521.

It is an arithmetic number, because the mean of its divisors is an integer number (811176960).

Almost surely, 2^21244334321 is an apocalyptic number.

It is an amenable number.

21244334321 is a deficient number, since it is larger than the sum of its proper divisors (4713328399).

21244334321 is a wasteful number, since it uses less digits than its factorization.

21244334321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9885.

The product of its digits is 13824, while the sum is 29.

Adding to 21244334321 its reverse (12343344212), we get a palindrome (33587678533).

The spelling of 21244334321 in words is "twenty-one billion, two hundred forty-four million, three hundred thirty-four thousand, three hundred twenty-one".