11788089721 has 2 divisors, whose sum is σ = 11788089722. Its totient is φ = 11788089720.

The previous prime is 11788089707. The next prime is 11788089727. The reversal of 11788089721 is 12798088711.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 10766967696 + 1021122025 = 103764^2 + 31955^2 .

It is an emirp because it is prime and its reverse (12798088711) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 11788089721 - 2²³ = 11779701113 is a prime.

It is not a weakly prime, because it can be changed into another prime (11788089727) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5894044860 + 5894044861.

It is an arithmetic number, because the mean of its divisors is an integer number (5894044861).

Almost surely, 2^11788089721 is an apocalyptic number.

It is an amenable number.

11788089721 is a deficient number, since it is larger than the sum of its proper divisors (1).

11788089721 is an equidigital number, since it uses as much as digits as its factorization.

11788089721 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 451584, while the sum is 52.

The spelling of 11788089721 in words is "eleven billion, seven hundred eighty-eight million, eighty-nine thousand, seven hundred twenty-one".