9643213633421 has 16 divisors (see below), whose sum is σ = 9984806487360. Its totient is φ = 9302227280640.

The previous prime is 9643213633387. The next prime is 9643213633423. The reversal of 9643213633421 is 1243363123469.

9643213633421 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-9643213633421 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9643213633423) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 448073141 + ... + 448094661.

It is an arithmetic number, because the mean of its divisors is an integer number (624050405460).

Almost surely, 2^{9643213633421} is an apocalyptic number.

It is an amenable number.

9643213633421 is a deficient number, since it is larger than the sum of its proper divisors (341592853939).

9643213633421 is a wasteful number, since it uses less digits than its factorization.

9643213633421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34876.

The product of its digits is 1679616, while the sum is 47.

The spelling of 9643213633421 in words is "nine trillion, six hundred forty-three billion, two hundred thirteen million, six hundred thirty-three thousand, four hundred twenty-one".