379646647021 has 2 divisors, whose sum is σ = 379646647022. Its totient is φ = 379646647020.

The previous prime is 379646646971. The next prime is 379646647043. The reversal of 379646647021 is 120746646973.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 378488265796 + 1158381225 = 615214^2 + 34035^2 .

It is an emirp because it is prime and its reverse (120746646973) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 379646647021 - 2³⁵ = 345286908653 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (379646647091) 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, 189823323510 + 189823323511.

It is an arithmetic number, because the mean of its divisors is an integer number (189823323511).

Almost surely, 2^379646647021 is an apocalyptic number.

It is an amenable number.

379646647021 is a deficient number, since it is larger than the sum of its proper divisors (1).

379646647021 is an equidigital number, since it uses as much as digits as its factorization.

379646647021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 9144576, while the sum is 55.

The spelling of 379646647021 in words is "three hundred seventy-nine billion, six hundred forty-six million, six hundred forty-seven thousand, twenty-one".