386366221721 has 2 divisors, whose sum is σ = 386366221722. Its totient is φ = 386366221720.

The previous prime is 386366221613. The next prime is 386366221739. The reversal of 386366221721 is 127122663683.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 210479088400 + 175887133321 = 458780^2 + 419389^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-386366221721 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (386366221751) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 193183110860 + 193183110861.

It is an arithmetic number, because the mean of its divisors is an integer number (193183110861).

Almost surely, 2^386366221721 is an apocalyptic number.

It is an amenable number.

386366221721 is a deficient number, since it is larger than the sum of its proper divisors (1).

386366221721 is an equidigital number, since it uses as much as digits as its factorization.

386366221721 is an evil number, because the sum of its binary digits is even.

The product of its digits is 870912, while the sum is 47.

The spelling of 386366221721 in words is "three hundred eighty-six billion, three hundred sixty-six million, two hundred twenty-one thousand, seven hundred twenty-one".