9933877721 has 8 divisors (see below), whose sum is σ = 10420061184. Its totient is φ = 9452217280.

The previous prime is 9933877687. The next prime is 9933877729. The reversal of 9933877721 is 1277783399.

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 9933877721 - 2³⁰ = 8860135897 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (9933877729) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1126256 + ... + 1135041.

It is an arithmetic number, because the mean of its divisors is an integer number (1302507648).

Almost surely, 2^9933877721 is an apocalyptic number.

It is an amenable number.

9933877721 is a deficient number, since it is larger than the sum of its proper divisors (486183463).

9933877721 is a wasteful number, since it uses less digits than its factorization.

9933877721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2261511.

The product of its digits is 4000752, while the sum is 56.

The square root of 9933877721 is about 99668.8402711700. The cubic root of 9933877721 is about 2149.6756475547.

The spelling of 9933877721 in words is "nine billion, nine hundred thirty-three million, eight hundred seventy-seven thousand, seven hundred twenty-one".