11785004721 has 12 divisors (see below), whose sum is σ = 19454611072. Its totient is φ = 6734288376.

The previous prime is 11785004719. The next prime is 11785004729. The reversal of 11785004721 is 12740058711.

11785004721 is a `hidden beast` number, since 11 + 78 + 500 + 4 + 72 + 1 = 666.

It is not a de Polignac number, because 11785004721 - 2¹ = 11785004719 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11785004729) 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 11 ways as a sum of consecutive naturals, for example, 93531721 + ... + 93531846.

Almost surely, 2^11785004721 is an apocalyptic number.

It is an amenable number.

11785004721 is a deficient number, since it is larger than the sum of its proper divisors (7669606351).

11785004721 is a wasteful number, since it uses less digits than its factorization.

11785004721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 187063580 (or 187063577 counting only the distinct ones).

The product of its (nonzero) digits is 15680, while the sum is 36.

The spelling of 11785004721 in words is "eleven billion, seven hundred eighty-five million, four thousand, seven hundred twenty-one".