4389547221 has 10 divisors (see below), whose sum is σ = 6557224982. Its totient is φ = 2926364760.

The previous prime is 4389547193. The next prime is 4389547223. The reversal of 4389547221 is 1227459834.

4389547221 is a `hidden beast` number, since 4 + 3 + 89 + 547 + 2 + 21 = 666.

It can be written as a sum of positive squares in only one way, i.e., 3940700625 + 448846596 = 62775^2 + 21186^2 .

It is not a de Polignac number, because 4389547221 - 2⁶ = 4389547157 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 (4389547223) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 27095890 + ... + 27096051.

Almost surely, 2^4389547221 is an apocalyptic number.

It is an amenable number.

4389547221 is a deficient number, since it is larger than the sum of its proper divisors (2167677761).

4389547221 is an equidigital number, since it uses as much as digits as its factorization.

4389547221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 54191953 (or 54191944 counting only the distinct ones).

The product of its digits is 483840, while the sum is 45.

The square root of 4389547221 is about 66253.6581707003. The cubic root of 4389547221 is about 1637.3439086379.

The spelling of 4389547221 in words is "four billion, three hundred eighty-nine million, five hundred forty-seven thousand, two hundred twenty-one".