3900000221 has 8 divisors (see below), whose sum is σ = 4382609280. Its totient is φ = 3443478192.

The previous prime is 3900000199. The next prime is 3900000239. The reversal of 3900000221 is 1220000093.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 3900000221 - 2⁶ = 3900000157 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 3900000221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3900000121) 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 7 ways as a sum of consecutive naturals, for example, 6521441 + ... + 6522038.

It is an arithmetic number, because the mean of its divisors is an integer number (547826160).

Almost surely, 2^3900000221 is an apocalyptic number.

It is an amenable number.

3900000221 is a deficient number, since it is larger than the sum of its proper divisors (482609059).

3900000221 is a wasteful number, since it uses less digits than its factorization.

3900000221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13043515.

The product of its (nonzero) digits is 108, while the sum is 17.

The square root of 3900000221 is about 62449.9817534001. The cubic root of 3900000221 is about 1574.0609463637.

The spelling of 3900000221 in words is "three billion, nine hundred million, two hundred twenty-one", and thus it is an aban number.