3813468272821 has 2 divisors, whose sum is σ = 3813468272822. Its totient is φ = 3813468272820.

The previous prime is 3813468272777. The next prime is 3813468272827. The reversal of 3813468272821 is 1282728643183.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2692516710321 + 1120951562500 = 1640889^2 + 1058750^2 .

It is a cyclic number.

It is not a de Polignac number, because 3813468272821 - 2¹⁵ = 3813468240053 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3813468272827) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1906734136410 + 1906734136411.

It is an arithmetic number, because the mean of its divisors is an integer number (1906734136411).

Almost surely, 2^{3813468272821} is an apocalyptic number.

It is an amenable number.

3813468272821 is a deficient number, since it is larger than the sum of its proper divisors (1).

3813468272821 is an equidigital number, since it uses as much as digits as its factorization.

3813468272821 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6193152, while the sum is 55.

The spelling of 3813468272821 in words is "three trillion, eight hundred thirteen billion, four hundred sixty-eight million, two hundred seventy-two thousand, eight hundred twenty-one".