3866700221 has 2 divisors, whose sum is σ = 3866700222. Its totient is φ = 3866700220.

The previous prime is 3866700217. The next prime is 3866700251. The reversal of 3866700221 is 1220076683.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3705765625 + 160934596 = 60875^2 + 12686^2 .

It is a cyclic number.

It is not a de Polignac number, because 3866700221 - 2² = 3866700217 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3866700251) 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 as a sum of consecutive naturals, namely, 1933350110 + 1933350111.

It is an arithmetic number, because the mean of its divisors is an integer number (1933350111).

Almost surely, 2^3866700221 is an apocalyptic number.

It is an amenable number.

3866700221 is a deficient number, since it is larger than the sum of its proper divisors (1).

3866700221 is an equidigital number, since it uses as much as digits as its factorization.

3866700221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 24192, while the sum is 35.

The square root of 3866700221 is about 62182.7968251670. The cubic root of 3866700221 is about 1569.5681153462.

The spelling of 3866700221 in words is "three billion, eight hundred sixty-six million, seven hundred thousand, two hundred twenty-one".