21041024440 has 64 divisors (see below), whose sum is σ = 50493261600. Its totient is φ = 7863472128.

The previous prime is 21041024419. The next prime is 21041024467. The reversal of 21041024440 is 4442014012.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 19770 + ... + 206089.

Almost surely, 2^21041024440 is an apocalyptic number.

21041024440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21041024440 is an abundant number, since it is smaller than the sum of its proper divisors (29452237160).

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

21041024440 is a wasteful number, since it uses less digits than its factorization.

21041024440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 226024 (or 226020 counting only the distinct ones).

The product of its (nonzero) digits is 1024, while the sum is 22.

Adding to 21041024440 its reverse (4442014012), we get a palindrome (25483038452).

The spelling of 21041024440 in words is "twenty-one billion, forty-one million, twenty-four thousand, four hundred forty".