821982606413 has 2 divisors, whose sum is σ = 821982606414. Its totient is φ = 821982606412.

The previous prime is 821982606377. The next prime is 821982606421. The reversal of 821982606413 is 314606289128.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 683867803369 + 138114803044 = 826963^2 + 371638^2 .

It is a cyclic number.

It is not a de Polignac number, because 821982606413 - 2¹⁸ = 821982344269 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (821982606443) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 410991303206 + 410991303207.

It is an arithmetic number, because the mean of its divisors is an integer number (410991303207).

Almost surely, 2^821982606413 is an apocalyptic number.

It is an amenable number.

821982606413 is a deficient number, since it is larger than the sum of its proper divisors (1).

821982606413 is an equidigital number, since it uses as much as digits as its factorization.

821982606413 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 995328, while the sum is 50.

The spelling of 821982606413 in words is "eight hundred twenty-one billion, nine hundred eighty-two million, six hundred six thousand, four hundred thirteen".