21052424424 has 16 divisors (see below), whose sum is σ = 52631061120. Its totient is φ = 7017474800.

The previous prime is 21052424339. The next prime is 21052424443. The reversal of 21052424424 is 42442425012.

It is a junction number, because it is equal to n+sod(n) for n = 21052424391 and 21052424400.

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, 438592152 + ... + 438592199.

It is an arithmetic number, because the mean of its divisors is an integer number (3289441320).

Almost surely, 2^21052424424 is an apocalyptic number.

21052424424 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

21052424424 is an abundant number, since it is smaller than the sum of its proper divisors (31578636696).

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

21052424424 is a wasteful number, since it uses less digits than its factorization.

21052424424 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 877184360 (or 877184356 counting only the distinct ones).

The product of its (nonzero) digits is 20480, while the sum is 30.

Adding to 21052424424 its reverse (42442425012), we get a palindrome (63494849436).

The spelling of 21052424424 in words is "twenty-one billion, fifty-two million, four hundred twenty-four thousand, four hundred twenty-four".