21371432384 has 14 divisors (see below), whose sum is σ = 42408936264. Its totient is φ = 10685716160.

The previous prime is 21371432339. The next prime is 21371432393. The reversal of 21371432384 is 48323417312.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 166964252 + ... + 166964379.

Almost surely, 2^21371432384 is an apocalyptic number.

It is an amenable number.

21371432384 is a deficient number, since it is larger than the sum of its proper divisors (21037503880).

21371432384 is an equidigital number, since it uses as much as digits as its factorization.

21371432384 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 333928643 (or 333928633 counting only the distinct ones).

The product of its digits is 96768, while the sum is 38.

Adding to 21371432384 its reverse (48323417312), we get a palindrome (69694849696).

The spelling of 21371432384 in words is "twenty-one billion, three hundred seventy-one million, four hundred thirty-two thousand, three hundred eighty-four".