821234579911 has 2 divisors, whose sum is σ = 821234579912. Its totient is φ = 821234579910.

The previous prime is 821234579887. The next prime is 821234579917. The reversal of 821234579911 is 119975432128.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 821234579911 - 2⁷ = 821234579783 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (821234579917) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 410617289955 + 410617289956.

It is an arithmetic number, because the mean of its divisors is an integer number (410617289956).

Almost surely, 2^821234579911 is an apocalyptic number.

821234579911 is a deficient number, since it is larger than the sum of its proper divisors (1).

821234579911 is an equidigital number, since it uses as much as digits as its factorization.

821234579911 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1088640, while the sum is 52.

The spelling of 821234579911 in words is "eight hundred twenty-one billion, two hundred thirty-four million, five hundred seventy-nine thousand, nine hundred eleven".