821064835454 has 16 divisors (see below), whose sum is σ = 1274989994496. Its totient is φ = 396144499800.

The previous prime is 821064835439. The next prime is 821064835469. The reversal of 821064835454 is 454538460128.

It is an interprime number because it is at equal distance from previous prime (821064835439) and next prime (821064835469).

It is a super-2 number, since 2×821064835454² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 19060592 + ... + 19103619.

It is an arithmetic number, because the mean of its divisors is an integer number (79686874656).

Almost surely, 2^821064835454 is an apocalyptic number.

821064835454 is a deficient number, since it is larger than the sum of its proper divisors (453925159042).

821064835454 is a wasteful number, since it uses less digits than its factorization.

821064835454 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38164591.

The product of its (nonzero) digits is 3686400, while the sum is 50.

The spelling of 821064835454 in words is "eight hundred twenty-one billion, sixty-four million, eight hundred thirty-five thousand, four hundred fifty-four".