821008434136 has 16 divisors (see below), whose sum is σ = 1679335433640. Its totient is φ = 373185651840.

The previous prime is 821008434119. The next prime is 821008434137. The reversal of 821008434136 is 631434800128.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (821008434137) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 4664820561 + ... + 4664820736.

Almost surely, 2^821008434136 is an apocalyptic number.

It is an amenable number.

821008434136 is an abundant number, since it is smaller than the sum of its proper divisors (858326999504).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

821008434136 is a wasteful number, since it uses less digits than its factorization.

821008434136 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9329641314 (or 9329641310 counting only the distinct ones).

The product of its (nonzero) digits is 110592, while the sum is 40.

The spelling of 821008434136 in words is "eight hundred twenty-one billion, eight million, four hundred thirty-four thousand, one hundred thirty-six".