821673254851 has 2 divisors, whose sum is σ = 821673254852. Its totient is φ = 821673254850.

The previous prime is 821673254833. The next prime is 821673254887. The reversal of 821673254851 is 158452376128.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 821673254851 - 2⁷ = 821673254723 is a prime.

It is not a weakly prime, because it can be changed into another prime (821673251851) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 410836627425 + 410836627426.

It is an arithmetic number, because the mean of its divisors is an integer number (410836627426).

Almost surely, 2^821673254851 is an apocalyptic number.

821673254851 is a deficient number, since it is larger than the sum of its proper divisors (1).

821673254851 is an equidigital number, since it uses as much as digits as its factorization.

821673254851 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3225600, while the sum is 52.

The spelling of 821673254851 in words is "eight hundred twenty-one billion, six hundred seventy-three million, two hundred fifty-four thousand, eight hundred fifty-one".