21671448436 has 24 divisors (see below), whose sum is σ = 41774451264. Its totient is φ = 9755018880.

The previous prime is 21671448419. The next prime is 21671448443. The reversal of 21671448436 is 63484417612.

It is a hoax number, since the sum of its digits (46) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2386405 + ... + 2395468.

It is an arithmetic number, because the mean of its divisors is an integer number (1740602136).

Almost surely, 2^21671448436 is an apocalyptic number.

It is an amenable number.

21671448436 is a deficient number, since it is larger than the sum of its proper divisors (20103002828).

21671448436 is a wasteful number, since it uses less digits than its factorization.

21671448436 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4781991 (or 4781989 counting only the distinct ones).

The product of its digits is 774144, while the sum is 46.

The spelling of 21671448436 in words is "twenty-one billion, six hundred seventy-one million, four hundred forty-eight thousand, four hundred thirty-six".