821402322620 has 96 divisors (see below), whose sum is σ = 1903731076800. Its totient is φ = 295206912000.

The previous prime is 821402322617. The next prime is 821402322683. The reversal of 821402322620 is 26223204128.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 52642820 + ... + 52658420.

It is an arithmetic number, because the mean of its divisors is an integer number (19830532050).

Almost surely, 2^821402322620 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 821402322620, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (951865538400).

821402322620 is an abundant number, since it is smaller than the sum of its proper divisors (1082328754180).

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

821402322620 is a wasteful number, since it uses less digits than its factorization.

821402322620 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18399 (or 18397 counting only the distinct ones).

The product of its (nonzero) digits is 18432, while the sum is 32.

Adding to 821402322620 its reverse (26223204128), we get a palindrome (847625526748).

The spelling of 821402322620 in words is "eight hundred twenty-one billion, four hundred two million, three hundred twenty-two thousand, six hundred twenty".