21113432430 has 16 divisors (see below), whose sum is σ = 50672237904. Its totient is φ = 5630248640.

The previous prime is 21113432399. The next prime is 21113432441. The reversal of 21113432430 is 3423431112.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 21113432430.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 351890511 + ... + 351890570.

It is an arithmetic number, because the mean of its divisors is an integer number (3167014869).

Almost surely, 2^21113432430 is an apocalyptic number.

21113432430 is an abundant number, since it is smaller than the sum of its proper divisors (29558805474).

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

21113432430 is a wasteful number, since it uses less digits than its factorization.

21113432430 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 703781091.

The product of its (nonzero) digits is 1728, while the sum is 24.

Adding to 21113432430 its reverse (3423431112), we get a palindrome (24536863542).

The spelling of 21113432430 in words is "twenty-one billion, one hundred thirteen million, four hundred thirty-two thousand, four hundred thirty".