21344042304 has 84 divisors (see below), whose sum is σ = 65884931476. Its totient is φ = 6567395328.

The previous prime is 21344042299. The next prime is 21344042309. The reversal of 21344042304 is 40324044312.

It is a happy number.

21344042304 is a `hidden beast` number, since 21 + 3 + 4 + 404 + 230 + 4 = 666.

It is an interprime number because it is at equal distance from previous prime (21344042299) and next prime (21344042309).

It can be written as a sum of positive squares in 2 ways, for example, as 14388482304 + 6955560000 = 119952^2 + 83400^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21344042309) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1417729 + ... + 1432704.

Almost surely, 2^21344042304 is an apocalyptic number.

21344042304 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

21344042304 is an abundant number, since it is smaller than the sum of its proper divisors (44540889172).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21344042304 is a wasteful number, since it uses less digits than its factorization.

21344042304 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2850464 (or 2850451 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 27.

Adding to 21344042304 its reverse (40324044312), we get a palindrome (61668086616).

The spelling of 21344042304 in words is "twenty-one billion, three hundred forty-four million, forty-two thousand, three hundred four".