321120220423400 has 96 divisors (see below), whose sum is σ = 749877735835800. Its totient is φ = 127885202227200.

The previous prime is 321120220423397. The next prime is 321120220423417. The reversal of 321120220423400 is 4324022021123.

It can be written as a sum of positive squares in 12 ways, for example, as 137448283659556 + 183671936763844 = 11723834^2 + 13552562^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 321120220423400.

It is an unprimeable number.

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 23 ways as a sum of consecutive naturals, for example, 205953134 + ... + 207506466.

Almost surely, 2^{321120220423400} 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 321120220423400, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (374938867917900).

321120220423400 is an abundant number, since it is smaller than the sum of its proper divisors (428757515412400).

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

321120220423400 is a wasteful number, since it uses less digits than its factorization.

321120220423400 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1557879 (or 1557870 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 26.

Adding to 321120220423400 its reverse (4324022021123), we get a palindrome (325444242444523).

The spelling of 321120220423400 in words is "three hundred twenty-one trillion, one hundred twenty billion, two hundred twenty million, four hundred twenty-three thousand, four hundred".