21423636430 has 24 divisors (see below), whose sum is σ = 44858472408. Its totient is φ = 7345246608.

The previous prime is 21423636413. The next prime is 21423636449. The reversal of 21423636430 is 3463632412.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 21860364 + ... + 21861343.

It is an arithmetic number, because the mean of its divisors is an integer number (1869103017).

Almost surely, 2^21423636430 is an apocalyptic number.

21423636430 is an abundant number, since it is smaller than the sum of its proper divisors (23434835978).

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

21423636430 is a wasteful number, since it uses less digits than its factorization.

21423636430 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43721728 (or 43721721 counting only the distinct ones).

The product of its (nonzero) digits is 62208, while the sum is 34.

The spelling of 21423636430 in words is "twenty-one billion, four hundred twenty-three million, six hundred thirty-six thousand, four hundred thirty".