5185255846921 has 2 divisors, whose sum is σ = 5185255846922. Its totient is φ = 5185255846920.

The previous prime is 5185255846877. The next prime is 5185255846943. The reversal of 5185255846921 is 1296485525815.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2843391847696 + 2341863999225 = 1686236^2 + 1530315^2 .

It is a cyclic number.

It is not a de Polignac number, because 5185255846921 - 2⁹ = 5185255846409 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 5185255846921.

It is not a weakly prime, because it can be changed into another prime (5185255826921) 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, 2592627923460 + 2592627923461.

It is an arithmetic number, because the mean of its divisors is an integer number (2592627923461).

Almost surely, 2^{5185255846921} is an apocalyptic number.

It is an amenable number.

5185255846921 is a deficient number, since it is larger than the sum of its proper divisors (1).

5185255846921 is an equidigital number, since it uses as much as digits as its factorization.

5185255846921 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 34560000, while the sum is 61.

The spelling of 5185255846921 in words is "five trillion, one hundred eighty-five billion, two hundred fifty-five million, eight hundred forty-six thousand, nine hundred twenty-one".