384004827821 has 2 divisors, whose sum is σ = 384004827822. Its totient is φ = 384004827820.

The previous prime is 384004827761. The next prime is 384004827839. The reversal of 384004827821 is 128728400483.

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., 383749275625 + 255552196 = 619475^2 + 15986^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-384004827821 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (384004827121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 192002413910 + 192002413911.

It is an arithmetic number, because the mean of its divisors is an integer number (192002413911).

Almost surely, 2^384004827821 is an apocalyptic number.

It is an amenable number.

384004827821 is a deficient number, since it is larger than the sum of its proper divisors (1).

384004827821 is an equidigital number, since it uses as much as digits as its factorization.

384004827821 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 688128, while the sum is 47.

The spelling of 384004827821 in words is "three hundred eighty-four billion, four million, eight hundred twenty-seven thousand, eight hundred twenty-one".