378941021 has 2 divisors, whose sum is σ = 378941022. Its totient is φ = 378941020.

The previous prime is 378940981. The next prime is 378941027. The reversal of 378941021 is 120149873.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 338044996 + 40896025 = 18386^2 + 6395^2 .

It is an emirp because it is prime and its reverse (120149873) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 378941021 - 2²² = 374746717 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (378941027) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 189470510 + 189470511.

It is an arithmetic number, because the mean of its divisors is an integer number (189470511).

Almost surely, 2^378941021 is an apocalyptic number.

It is an amenable number.

378941021 is a deficient number, since it is larger than the sum of its proper divisors (1).

378941021 is an equidigital number, since it uses as much as digits as its factorization.

378941021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 12096, while the sum is 35.

The square root of 378941021 is about 19466.4075011287. The cubic root of 378941021 is about 723.6421805872.

The spelling of 378941021 in words is "three hundred seventy-eight million, nine hundred forty-one thousand, twenty-one".