321021133356 has 384 divisors, whose sum is σ = 1006240112640. Its totient is φ = 77150361600.

The previous prime is 321021133327. The next prime is 321021133357. The reversal of 321021133356 is 653331120123.

It is a super-2 number, since 2×321021133356² (a number of 24 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (321021133357) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 137128746 + ... + 137131086.

It is an arithmetic number, because the mean of its divisors is an integer number (2620416960).

Almost surely, 2^321021133356 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 321021133356, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (503120056320).

321021133356 is an abundant number, since it is smaller than the sum of its proper divisors (685218979284).

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

321021133356 is a wasteful number, since it uses less digits than its factorization.

321021133356 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2565 (or 2563 counting only the distinct ones).

The product of its (nonzero) digits is 9720, while the sum is 30.

Adding to 321021133356 its reverse (653331120123), we get a palindrome (974352253479).

The spelling of 321021133356 in words is "three hundred twenty-one billion, twenty-one million, one hundred thirty-three thousand, three hundred fifty-six".