11719249908921 has 45 divisors (see below), whose sum is σ = 17889148799071. Its totient is φ = 7645657935888.

The previous prime is 11719249908911. The next prime is 11719249908979. The reversal of 11719249908921 is 12980994291711.

The square root of 11719249908921 is 3423339.

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

11719249908921 is a `hidden beast` number, since 117 + 1 + 9 + 2 + 499 + 0 + 8 + 9 + 21 = 666.

11719249908921 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 5130972477225 + 6588277431696 = 2265165^2 + 2566764^2 .

It is not a de Polignac number, because 11719249908921 - 2²⁹ = 11718713038009 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11719249908901) by changing a digit.

It is a polite number, since it can be written in 44 ways as a sum of consecutive naturals, for example, 1448068351 + ... + 1448076443.

Almost surely, 2^{11719249908921} is an apocalyptic number.

11719249908921 is the 3423339-th square number.

11719249908921 is the 1711670-th centered octagonal number.

It is an amenable number.

11719249908921 is a deficient number, since it is larger than the sum of its proper divisors (6169898890150).

11719249908921 is an frugal number, since it uses more digits than its factorization.

11719249908921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16292 (or 8143 counting only the distinct ones).

The product of its (nonzero) digits is 5878656, while the sum is 63.

The spelling of 11719249908921 in words is "eleven trillion, seven hundred nineteen billion, two hundred forty-nine million, nine hundred eight thousand, nine hundred twenty-one".