21344440024 has 16 divisors (see below), whose sum is σ = 40503004920. Its totient is φ = 10543638720.

The previous prime is 21344439973. The next prime is 21344440027. The reversal of 21344440024 is 42004444312.

It is a junction number, because it is equal to n+sod(n) for n = 21344439974 and 21344440001.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21344440027) 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, 16071957 + ... + 16073284.

Almost surely, 2^21344440024 is an apocalyptic number.

It is an amenable number.

21344440024 is a deficient number, since it is larger than the sum of its proper divisors (19158564896).

21344440024 is a wasteful number, since it uses less digits than its factorization.

21344440024 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32145330 (or 32145326 counting only the distinct ones).

The product of its (nonzero) digits is 12288, while the sum is 28.

Adding to 21344440024 its reverse (42004444312), we get a palindrome (63348884336).

The spelling of 21344440024 in words is "twenty-one billion, three hundred forty-four million, four hundred forty thousand, twenty-four".