378841480921 has 2 divisors, whose sum is σ = 378841480922. Its totient is φ = 378841480920.

The previous prime is 378841480903. The next prime is 378841480931. The reversal of 378841480921 is 129084148873.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 347392360000 + 31449120921 = 589400^2 + 177339^2 .

It is an emirp because it is prime and its reverse (129084148873) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 378841480921 - 2¹⁷ = 378841349849 is a prime.

It is not a weakly prime, because it can be changed into another prime (378841480931) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 189420740460 + 189420740461.

It is an arithmetic number, because the mean of its divisors is an integer number (189420740461).

Almost surely, 2^378841480921 is an apocalyptic number.

It is an amenable number.

378841480921 is a deficient number, since it is larger than the sum of its proper divisors (1).

378841480921 is an equidigital number, since it uses as much as digits as its factorization.

378841480921 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3096576, while the sum is 55.

The spelling of 378841480921 in words is "three hundred seventy-eight billion, eight hundred forty-one million, four hundred eighty thousand, nine hundred twenty-one".