21743960693764 has 27 divisors (see below), whose sum is σ = 38275996078047. Its totient is φ = 10808334486624.

The previous prime is 21743960693659. The next prime is 21743960693771. The reversal of 21743960693764 is 46739606934712.

The square root of 21743960693764 is 4663042.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in 4 ways, for example, as 8406856693764 + 13337104000000 = 2899458^2 + 3652000^2 .

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21743960693764.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 1613405794 + ... + 1613419270.

Almost surely, 2^{21743960693764} is an apocalyptic number.

21743960693764 is the 4663042-nd square number.

It is an amenable number.

21743960693764 is a deficient number, since it is larger than the sum of its proper divisors (16532035384283).

21743960693764 is an frugal number, since it uses more digits than its factorization.

21743960693764 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27304 (or 13652 counting only the distinct ones).

The product of its (nonzero) digits is 246903552, while the sum is 67.

The spelling of 21743960693764 in words is "twenty-one trillion, seven hundred forty-three billion, nine hundred sixty million, six hundred ninety-three thousand, seven hundred sixty-four".