21344443040 has 24 divisors (see below), whose sum is σ = 50426247060. Its totient is φ = 8537777152.

The previous prime is 21344443037. The next prime is 21344443061. The reversal of 21344443040 is 4034444312.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 21084201616 + 260241424 = 145204^2 + 16132^2 .

It is a junction number, because it is equal to n+sod(n) for n = 21344442994 and 21344443012.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 66701225 + ... + 66701544.

Almost surely, 2^21344443040 is an apocalyptic number.

21344443040 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21344443040 is an abundant number, since it is smaller than the sum of its proper divisors (29081804020).

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

21344443040 is a wasteful number, since it uses less digits than its factorization.

21344443040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 133402784 (or 133402776 counting only the distinct ones).

The product of its (nonzero) digits is 18432, while the sum is 29.

Adding to 21344443040 its reverse (4034444312), we get a palindrome (25378887352).

The spelling of 21344443040 in words is "twenty-one billion, three hundred forty-four million, four hundred forty-three thousand, forty".