21303586406 has 12 divisors (see below), whose sum is σ = 32700605652. Its totient is φ = 10403416044.

The previous prime is 21303586399. The next prime is 21303586481. The reversal of 21303586406 is 60468530312.

It is a self number, because there is not a number n which added to its sum of digits gives 21303586406.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1345685 + ... + 1361423.

It is an arithmetic number, because the mean of its divisors is an integer number (2725050471).

Almost surely, 2^21303586406 is an apocalyptic number.

21303586406 is a deficient number, since it is larger than the sum of its proper divisors (11397019246).

21303586406 is an frugal number, since it uses more digits than its factorization.

21303586406 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31523 (or 15784 counting only the distinct ones).

The product of its (nonzero) digits is 103680, while the sum is 38.

The spelling of 21303586406 in words is "twenty-one billion, three hundred three million, five hundred eighty-six thousand, four hundred six".