3989139158221 has 24 divisors (see below), whose sum is σ = 4666408220160. Its totient is φ = 3400131168000.

The previous prime is 3989139158201. The next prime is 3989139158267. The reversal of 3989139158221 is 1228519319893.

It is not a de Polignac number, because 3989139158221 - 2²⁹ = 3988602287309 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 3989139158221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3989139158201) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 26307421 + ... + 26458621.

It is an arithmetic number, because the mean of its divisors is an integer number (194433675840).

Almost surely, 2^{3989139158221} is an apocalyptic number.

It is an amenable number.

3989139158221 is a deficient number, since it is larger than the sum of its proper divisors (677269061939).

3989139158221 is a wasteful number, since it uses less digits than its factorization.

3989139158221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 154225 (or 154218 counting only the distinct ones).

The product of its digits is 8398080, while the sum is 61.

The spelling of 3989139158221 in words is "three trillion, nine hundred eighty-nine billion, one hundred thirty-nine million, one hundred fifty-eight thousand, two hundred twenty-one".