821673254833 has 2 divisors, whose sum is σ = 821673254834. Its totient is φ = 821673254832.

The previous prime is 821673254797. The next prime is 821673254851. The reversal of 821673254833 is 338452376128.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 416046930289 + 405626324544 = 645017^2 + 636888^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-821673254833 is a prime.

It is not a weakly prime, because it can be changed into another prime (821674254833) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 410836627416 + 410836627417.

It is an arithmetic number, because the mean of its divisors is an integer number (410836627417).

Almost surely, 2^821673254833 is an apocalyptic number.

It is an amenable number.

821673254833 is a deficient number, since it is larger than the sum of its proper divisors (1).

821673254833 is an equidigital number, since it uses as much as digits as its factorization.

821673254833 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5806080, while the sum is 52.

The spelling of 821673254833 in words is "eight hundred twenty-one billion, six hundred seventy-three million, two hundred fifty-four thousand, eight hundred thirty-three".