21042504430 has 16 divisors (see below), whose sum is σ = 37962015984. Its totient is φ = 8398000000.

The previous prime is 21042504421. The next prime is 21042504437. The reversal of 21042504430 is 3440524012.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 21042504395 and 21042504404.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21042504437) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2370571 + ... + 2379430.

It is an arithmetic number, because the mean of its divisors is an integer number (2372625999).

Almost surely, 2^21042504430 is an apocalyptic number.

21042504430 is a deficient number, since it is larger than the sum of its proper divisors (16919511554).

21042504430 is a wasteful number, since it uses less digits than its factorization.

21042504430 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4750451.

The product of its (nonzero) digits is 3840, while the sum is 25.

The spelling of 21042504430 in words is "twenty-one billion, forty-two million, five hundred four thousand, four hundred thirty".