21043353024 has 84 divisors (see below), whose sum is σ = 63491582440. Its totient is φ = 6645265920.

The previous prime is 21043353017. The next prime is 21043353053. The reversal of 21043353024 is 42035334012.

21043353024 is a `hidden beast` number, since 2 + 104 + 3 + 3 + 530 + 24 = 666.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 950467 + ... + 972354.

Almost surely, 2^21043353024 is an apocalyptic number.

21043353024 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

21043353024 is an abundant number, since it is smaller than the sum of its proper divisors (42448229416).

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

21043353024 is a wasteful number, since it uses less digits than its factorization.

21043353024 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1922858 (or 1922845 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 27.

Adding to 21043353024 its reverse (42035334012), we get a palindrome (63078687036).

The spelling of 21043353024 in words is "twenty-one billion, forty-three million, three hundred fifty-three thousand, twenty-four".