821334090634 has 8 divisors (see below), whose sum is σ = 1232791391520. Its totient is φ = 410403626796.

The previous prime is 821334090611. The next prime is 821334090637. The reversal of 821334090634 is 436090433128.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (821334090637) 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, 131705364 + ... + 131711599.

It is an arithmetic number, because the mean of its divisors is an integer number (154098923940).

Almost surely, 2^821334090634 is an apocalyptic number.

821334090634 is a deficient number, since it is larger than the sum of its proper divisors (411457300886).

821334090634 is a wasteful number, since it uses less digits than its factorization.

821334090634 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 263418524.

The product of its (nonzero) digits is 373248, while the sum is 43.

The spelling of 821334090634 in words is "eight hundred twenty-one billion, three hundred thirty-four million, ninety thousand, six hundred thirty-four".