821055330420 has 96 divisors (see below), whose sum is σ = 2555662126080. Its totient is φ = 195586375680.

The previous prime is 821055330401. The next prime is 821055330461. The reversal of 821055330420 is 24033550128.

It is a super-2 number, since 2×821055330420² (a number of 25 digits) contains 22 as substring.

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, 16953805 + ... + 17002164.

It is an arithmetic number, because the mean of its divisors is an integer number (26621480480).

Almost surely, 2^821055330420 is an apocalyptic number.

It is an amenable number.

821055330420 is an abundant number, since it is smaller than the sum of its proper divisors (1734606795660).

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

821055330420 is a wasteful number, since it uses less digits than its factorization.

821055330420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33956025 (or 33956023 counting only the distinct ones).

The product of its (nonzero) digits is 28800, while the sum is 33.

Adding to 821055330420 its reverse (24033550128), we get a palindrome (845088880548).

The spelling of 821055330420 in words is "eight hundred twenty-one billion, fifty-five million, three hundred thirty thousand, four hundred twenty".