21344000240 has 20 divisors (see below), whose sum is σ = 49624800744. Its totient is φ = 8537600064.

The previous prime is 21344000239. The next prime is 21344000273. The reversal of 21344000240 is 4200044312.

It is a tau number, because it is divible by the number of its divisors (20).

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 133399922 + ... + 133400081.

Almost surely, 2^21344000240 is an apocalyptic number.

21344000240 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21344000240 is an abundant number, since it is smaller than the sum of its proper divisors (28280800504).

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

21344000240 is a wasteful number, since it uses less digits than its factorization.

21344000240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 266800016 (or 266800010 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 20.

Adding to 21344000240 its reverse (4200044312), we get a palindrome (25544044552).

The spelling of 21344000240 in words is "twenty-one billion, three hundred forty-four million, two hundred forty", and thus it is an aban number.