6389018221 has 4 divisors (see below), whose sum is σ = 6389203744. Its totient is φ = 6388832700.

The previous prime is 6389018219. The next prime is 6389018243. The reversal of 6389018221 is 1228109836.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 6389018221 - 2¹ = 6389018219 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 (6389018291) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 24225 + ... + 115606.

It is an arithmetic number, because the mean of its divisors is an integer number (1597300936).

Almost surely, 2^6389018221 is an apocalyptic number.

It is an amenable number.

6389018221 is a deficient number, since it is larger than the sum of its proper divisors (185523).

6389018221 is a wasteful number, since it uses less digits than its factorization.

6389018221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 185522.

The product of its (nonzero) digits is 41472, while the sum is 40.

The square root of 6389018221 is about 79931.3344127320. The cubic root of 6389018221 is about 1855.5729899981.

The spelling of 6389018221 in words is "six billion, three hundred eighty-nine million, eighteen thousand, two hundred twenty-one".