11847954221 has 2 divisors, whose sum is σ = 11847954222. Its totient is φ = 11847954220.

The previous prime is 11847954193. The next prime is 11847954253. The reversal of 11847954221 is 12245974811.

It is a happy number.

11847954221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11106208996 + 741745225 = 105386^2 + 27235^2 .

It is a cyclic number.

It is not a de Polignac number, because 11847954221 - 2²⁶ = 11780845357 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11847951221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5923977110 + 5923977111.

It is an arithmetic number, because the mean of its divisors is an integer number (5923977111).

Almost surely, 2^11847954221 is an apocalyptic number.

It is an amenable number.

11847954221 is a deficient number, since it is larger than the sum of its proper divisors (1).

11847954221 is an equidigital number, since it uses as much as digits as its factorization.

11847954221 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 161280, while the sum is 44.

The spelling of 11847954221 in words is "eleven billion, eight hundred forty-seven million, nine hundred fifty-four thousand, two hundred twenty-one".