821234579887 has 2 divisors, whose sum is σ = 821234579888. Its totient is φ = 821234579886.

The previous prime is 821234579861. The next prime is 821234579911. The reversal of 821234579887 is 788975432128.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 821234579887 - 2³¹ = 819087096239 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (821234579807) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 410617289943 + 410617289944.

It is an arithmetic number, because the mean of its divisors is an integer number (410617289944).

Almost surely, 2^821234579887 is an apocalyptic number.

821234579887 is a deficient number, since it is larger than the sum of its proper divisors (1).

821234579887 is an equidigital number, since it uses as much as digits as its factorization.

821234579887 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 54190080, while the sum is 64.

The spelling of 821234579887 in words is "eight hundred twenty-one billion, two hundred thirty-four million, five hundred seventy-nine thousand, eight hundred eighty-seven".