21430543443 has 16 divisors (see below), whose sum is σ = 29499724800. Its totient is φ = 13824318240.

The previous prime is 21430543439. The next prime is 21430543469. The reversal of 21430543443 is 34434503412.

It is not a de Polignac number, because 21430543443 - 2² = 21430543439 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21430543483) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1221588 + ... + 1239006.

It is an arithmetic number, because the mean of its divisors is an integer number (1843732800).

Almost surely, 2^21430543443 is an apocalyptic number.

21430543443 is a deficient number, since it is larger than the sum of its proper divisors (8069181357).

21430543443 is a wasteful number, since it uses less digits than its factorization.

21430543443 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30682.

The product of its (nonzero) digits is 69120, while the sum is 33.

The spelling of 21430543443 in words is "twenty-one billion, four hundred thirty million, five hundred forty-three thousand, four hundred forty-three".