384156442421 has 2 divisors, whose sum is σ = 384156442422. Its totient is φ = 384156442420.

The previous prime is 384156442367. The next prime is 384156442427. The reversal of 384156442421 is 124244651483.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 290574902500 + 93581539921 = 539050^2 + 305911^2 .

It is a cyclic number.

It is not a de Polignac number, because 384156442421 - 2¹⁰ = 384156441397 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (384156442427) 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, 192078221210 + 192078221211.

It is an arithmetic number, because the mean of its divisors is an integer number (192078221211).

Almost surely, 2^384156442421 is an apocalyptic number.

It is an amenable number.

384156442421 is a deficient number, since it is larger than the sum of its proper divisors (1).

384156442421 is an equidigital number, since it uses as much as digits as its factorization.

384156442421 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 737280, while the sum is 44.

The spelling of 384156442421 in words is "three hundred eighty-four billion, one hundred fifty-six million, four hundred forty-two thousand, four hundred twenty-one".