21043034430 has 32 divisors (see below), whose sum is σ = 55094491008. Its totient is φ = 5101341600.

The previous prime is 21043034429. The next prime is 21043034449. The reversal of 21043034430 is 3443034012.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 21043034430.

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, 31883056 + ... + 31883715.

It is an arithmetic number, because the mean of its divisors is an integer number (1721702844).

Almost surely, 2^21043034430 is an apocalyptic number.

21043034430 is an abundant number, since it is smaller than the sum of its proper divisors (34051456578).

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

21043034430 is a wasteful number, since it uses less digits than its factorization.

21043034430 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 63766792.

The product of its (nonzero) digits is 3456, while the sum is 24.

Adding to 21043034430 its reverse (3443034012), we get a palindrome (24486068442).

The spelling of 21043034430 in words is "twenty-one billion, forty-three million, thirty-four thousand, four hundred thirty".