9721733427 has 24 divisors (see below), whose sum is σ = 16754010000. Its totient is φ = 5555275488.

The previous prime is 9721733381. The next prime is 9721733431. The reversal of 9721733427 is 7243371279.

9721733427 is a `hidden beast` number, since 9 + 7 + 217 + 3 + 3 + 427 = 666.

9721733427 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 9721733427 - 2¹⁸ = 9721471283 is a prime.

It is a super-3 number, since 3×9721733427³ (a number of 31 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (9721733447) 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 in 23 ways as a sum of consecutive naturals, for example, 3672802 + ... + 3675447.

It is an arithmetic number, because the mean of its divisors is an integer number (698083750).

Almost surely, 2^9721733427 is an apocalyptic number.

9721733427 is a deficient number, since it is larger than the sum of its proper divisors (7032276573).

9721733427 is a wasteful number, since it uses less digits than its factorization.

9721733427 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7348272 (or 7348259 counting only the distinct ones).

The product of its digits is 444528, while the sum is 45.

The square root of 9721733427 is about 98598.8510430015. The cubic root of 9721733427 is about 2134.2628396572.

The spelling of 9721733427 in words is "nine billion, seven hundred twenty-one million, seven hundred thirty-three thousand, four hundred twenty-seven".