3864381221 has 2 divisors, whose sum is σ = 3864381222. Its totient is φ = 3864381220.

The previous prime is 3864381203. The next prime is 3864381239. The reversal of 3864381221 is 1221834683.

It is a happy number.

It is a balanced prime because it is at equal distance from previous prime (3864381203) and next prime (3864381239).

It can be written as a sum of positive squares in only one way, i.e., 3857776321 + 6604900 = 62111^2 + 2570^2 .

It is a cyclic number.

It is not a de Polignac number, because 3864381221 - 2¹⁰ = 3864380197 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3864381281) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1932190610 + 1932190611.

It is an arithmetic number, because the mean of its divisors is an integer number (1932190611).

Almost surely, 2^3864381221 is an apocalyptic number.

It is an amenable number.

3864381221 is a deficient number, since it is larger than the sum of its proper divisors (1).

3864381221 is an equidigital number, since it uses as much as digits as its factorization.

3864381221 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 55296, while the sum is 38.

The square root of 3864381221 is about 62164.1473922067. The cubic root of 3864381221 is about 1569.2542770052.

The spelling of 3864381221 in words is "three billion, eight hundred sixty-four million, three hundred eighty-one thousand, two hundred twenty-one".