21688403468 has 24 divisors (see below), whose sum is σ = 39221933520. Its totient is φ = 10487131200.

The previous prime is 21688403459. The next prime is 21688403509. The reversal of 21688403468 is 86430488612.

It is a happy 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, 606863 + ... + 641606.

It is an arithmetic number, because the mean of its divisors is an integer number (1634247230).

Almost surely, 2^21688403468 is an apocalyptic number.

It is an amenable number.

21688403468 is a deficient number, since it is larger than the sum of its proper divisors (17533530052).

21688403468 is a wasteful number, since it uses less digits than its factorization.

21688403468 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1248617 (or 1248615 counting only the distinct ones).

The product of its (nonzero) digits is 1769472, while the sum is 50.

The spelling of 21688403468 in words is "twenty-one billion, six hundred eighty-eight million, four hundred three thousand, four hundred sixty-eight".