21441032440 has 64 divisors (see below), whose sum is σ = 48550894560. Its totient is φ = 8521728000.

The previous prime is 21441032419. The next prime is 21441032443. The reversal of 21441032440 is 4423014412.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21441032443) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4585944 + ... + 4590616.

Almost surely, 2^21441032440 is an apocalyptic number.

21441032440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21441032440 is an abundant number, since it is smaller than the sum of its proper divisors (27109862120).

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

21441032440 is a wasteful number, since it uses less digits than its factorization.

21441032440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5392 (or 5388 counting only the distinct ones).

The product of its (nonzero) digits is 3072, while the sum is 25.

Adding to 21441032440 its reverse (4423014412), we get a palindrome (25864046852).

The spelling of 21441032440 in words is "twenty-one billion, four hundred forty-one million, thirty-two thousand, four hundred forty".