9789239036221 has 4 divisors (see below), whose sum is σ = 9799686464092. Its totient is φ = 9778791608352.

The previous prime is 9789239036207. The next prime is 9789239036231. The reversal of 9789239036221 is 1226309329879.

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 5786978716996 + 4002260319225 = 2405614^2 + 2000565^2 .

It is a cyclic number.

It is not a de Polignac number, because 9789239036221 - 2⁵ = 9789239036189 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 9789239036221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9789239036201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5223712530 + ... + 5223714403.

It is an arithmetic number, because the mean of its divisors is an integer number (2449921616023).

Almost surely, 2^{9789239036221} is an apocalyptic number.

It is an amenable number.

9789239036221 is a deficient number, since it is larger than the sum of its proper divisors (10447427871).

9789239036221 is a wasteful number, since it uses less digits than its factorization.

9789239036221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10447427870.

The product of its (nonzero) digits is 17635968, while the sum is 61.

The spelling of 9789239036221 in words is "nine trillion, seven hundred eighty-nine billion, two hundred thirty-nine million, thirty-six thousand, two hundred twenty-one".