11704859721 has 21 divisors (see below), whose sum is σ = 17553642301. Its totient is φ = 7801292412.

The previous prime is 11704859711. The next prime is 11704859723. The reversal of 11704859721 is 12795840711.

It is a happy number.

The square root of 11704859721 is 108189.

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

11704859721 is a `hidden beast` number, since 1 + 17 + 0 + 48 + 597 + 2 + 1 = 666.

It is not a de Polignac number, because 11704859721 - 2⁹ = 11704859209 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11704859723) by changing a digit.

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 20 ways as a sum of consecutive naturals, for example, 2919100 + ... + 2923106.

Almost surely, 2^11704859721 is an apocalyptic number.

11704859721 is the 108189-th square number.

11704859721 is the 54095-th centered octagonal number.

It is an amenable number.

11704859721 is a deficient number, since it is larger than the sum of its proper divisors (5848782580).

11704859721 is an frugal number, since it uses more digits than its factorization.

11704859721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8032 (or 4010 counting only the distinct ones).

The product of its (nonzero) digits is 141120, while the sum is 45.

The spelling of 11704859721 in words is "eleven billion, seven hundred four million, eight hundred fifty-nine thousand, seven hundred twenty-one".