21366362716172 has 12 divisors (see below), whose sum is σ = 37416762683160. Its totient is φ = 10675859092416.

The previous prime is 21366362716141. The next prime is 21366362716247. The reversal of 21366362716172 is 27161726366312.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1830559853 + ... + 1830571524.

It is an arithmetic number, because the mean of its divisors is an integer number (3118063556930).

Almost surely, 2^{21366362716172} is an apocalyptic number.

It is an amenable number.

21366362716172 is a deficient number, since it is larger than the sum of its proper divisors (16050399966988).

21366362716172 is a wasteful number, since it uses less digits than its factorization.

21366362716172 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3661132840 (or 3661132838 counting only the distinct ones).

The product of its digits is 4572288, while the sum is 53.

The spelling of 21366362716172 in words is "twenty-one trillion, three hundred sixty-six billion, three hundred sixty-two million, seven hundred sixteen thousand, one hundred seventy-two".