9963620921 has 4 divisors (see below), whose sum is σ = 10002390132. Its totient is φ = 9924851712.

The previous prime is 9963620897. The next prime is 9963620939. The reversal of 9963620921 is 1290263699.

9963620921 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 5934545296 + 4029075625 = 77036^2 + 63475^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-9963620921 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (9963620021) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 19384220 + ... + 19384733.

It is an arithmetic number, because the mean of its divisors is an integer number (2500597533).

Almost surely, 2^9963620921 is an apocalyptic number.

It is an amenable number.

9963620921 is a deficient number, since it is larger than the sum of its proper divisors (38769211).

9963620921 is a wasteful number, since it uses less digits than its factorization.

9963620921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38769210.

The product of its (nonzero) digits is 314928, while the sum is 47.

The square root of 9963620921 is about 99817.9388737315. The cubic root of 9963620921 is about 2151.8189705545.

The spelling of 9963620921 in words is "nine billion, nine hundred sixty-three million, six hundred twenty thousand, nine hundred twenty-one".