3908000221 has 2 divisors, whose sum is σ = 3908000222. Its totient is φ = 3908000220.

The previous prime is 3908000153. The next prime is 3908000231. The reversal of 3908000221 is 1220008093.

3908000221 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 3908000196 + 25 = 62514^2 + 5^2 .

It is a cyclic number.

It is not a de Polignac number, because 3908000221 - 2²⁹ = 3371129309 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3908000231) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1954000110 + 1954000111.

It is an arithmetic number, because the mean of its divisors is an integer number (1954000111).

Almost surely, 2^3908000221 is an apocalyptic number.

It is an amenable number.

3908000221 is a deficient number, since it is larger than the sum of its proper divisors (1).

3908000221 is an equidigital number, since it uses as much as digits as its factorization.

3908000221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 864, while the sum is 25.

The square root of 3908000221 is about 62514.0001999552. Note that the first 3 decimals coincide. The cubic root of 3908000221 is about 1575.1364922106.

Subtracting from 3908000221 its sum of digits (25), we obtain a square (3908000196 = 62514²).

The spelling of 3908000221 in words is "three billion, nine hundred eight million, two hundred twenty-one", and thus it is an aban number.