3478346821 has 2 divisors, whose sum is σ = 3478346822. Its totient is φ = 3478346820.

The previous prime is 3478346803. The next prime is 3478346843. The reversal of 3478346821 is 1286438743.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2283884100 + 1194462721 = 47790^2 + 34561^2 .

It is a cyclic number.

It is not a de Polignac number, because 3478346821 - 2⁵ = 3478346789 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3478346021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1739173410 + 1739173411.

It is an arithmetic number, because the mean of its divisors is an integer number (1739173411).

Almost surely, 2^3478346821 is an apocalyptic number.

It is an amenable number.

3478346821 is a deficient number, since it is larger than the sum of its proper divisors (1).

3478346821 is an equidigital number, since it uses as much as digits as its factorization.

3478346821 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 774144, while the sum is 46.

The square root of 3478346821 is about 58977.5111461988. The cubic root of 3478346821 is about 1515.1569684906.

The spelling of 3478346821 in words is "three billion, four hundred seventy-eight million, three hundred forty-six thousand, eight hundred twenty-one".