9721994371 has 8 divisors (see below), whose sum is σ = 9768968384. Its totient is φ = 9675109800.

The previous prime is 9721994341. The next prime is 9721994383. The reversal of 9721994371 is 1734991279.

9721994371 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 9721994371 - 2²³ = 9713605763 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (9721994341) 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 7 ways as a sum of consecutive naturals, for example, 200896 + ... + 244546.

It is an arithmetic number, because the mean of its divisors is an integer number (1221121048).

Almost surely, 2^9721994371 is an apocalyptic number.

9721994371 is a deficient number, since it is larger than the sum of its proper divisors (46974013).

9721994371 is a wasteful number, since it uses less digits than its factorization.

9721994371 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44721.

The product of its digits is 857304, while the sum is 52.

The square root of 9721994371 is about 98600.1742949778. The cubic root of 9721994371 is about 2134.2819349521.

The spelling of 9721994371 in words is "nine billion, seven hundred twenty-one million, nine hundred ninety-four thousand, three hundred seventy-one".