9438071821 has 16 divisors (see below), whose sum is σ = 9651571200. Its totient is φ = 9226547200.

The previous prime is 9438071801. The next prime is 9438071857. The reversal of 9438071821 is 1281708349.

9438071821 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 9438071821 - 2⁷ = 9438071693 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 (9438071801) 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, 14723661 + ... + 14724301.

It is an arithmetic number, because the mean of its divisors is an integer number (603223200).

Almost surely, 2^9438071821 is an apocalyptic number.

It is an amenable number.

9438071821 is a deficient number, since it is larger than the sum of its proper divisors (213499379).

9438071821 is a wasteful number, since it uses less digits than its factorization.

9438071821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1700.

The product of its (nonzero) digits is 96768, while the sum is 43.

The square root of 9438071821 is about 97149.7391710343. The cubic root of 9438071821 is about 2113.2997060304.

The spelling of 9438071821 in words is "nine billion, four hundred thirty-eight million, seventy-one thousand, eight hundred twenty-one".