1323021385728 has 960 divisors, whose sum is σ = 4781360640000. Its totient is φ = 353158299648.

The previous prime is 1323021385717. The next prime is 1323021385757. The reversal of 1323021385728 is 8275831203231.

1323021385728 is a `hidden beast` number, since 1 + 3 + 23 + 0 + 21 + 38 + 572 + 8 = 666.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 6648348573 + ... + 6648348771.

It is an arithmetic number, because the mean of its divisors is an integer number (4980584000).

Almost surely, 2^{1323021385728} is an apocalyptic number.

1323021385728 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1323021385728, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2390680320000).

1323021385728 is an abundant number, since it is smaller than the sum of its proper divisors (3458339254272).

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

1323021385728 is a wasteful number, since it uses less digits than its factorization.

1323021385728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 375 (or 343 counting only the distinct ones).

The product of its (nonzero) digits is 483840, while the sum is 45.

Adding to 1323021385728 its reverse (8275831203231), we get a palindrome (9598852588959).

The spelling of 1323021385728 in words is "one trillion, three hundred twenty-three billion, twenty-one million, three hundred eighty-five thousand, seven hundred twenty-eight".