1321033344400 has 240 divisors, whose sum is σ = 3983494147200. Its totient is φ = 408985804800.

The previous prime is 1321033344361. The next prime is 1321033344431. The reversal of 1321033344400 is 44433301231.

It is a super-2 number, since 2×1321033344400² (a number of 25 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (28).

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 47 ways as a sum of consecutive naturals, for example, 4445272 + ... + 4733128.

It is an arithmetic number, because the mean of its divisors is an integer number (16597892280).

Almost surely, 2^{1321033344400} is an apocalyptic number.

1321033344400 is a gapful number since it is divisible by the number (10) 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 1321033344400, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1991747073600).

1321033344400 is an abundant number, since it is smaller than the sum of its proper divisors (2662460802800).

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

1321033344400 is a wasteful number, since it uses less digits than its factorization.

1321033344400 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 288042 (or 288031 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 28.

Adding to 1321033344400 its reverse (44433301231), we get a palindrome (1365466645631).

The spelling of 1321033344400 in words is "one trillion, three hundred twenty-one billion, thirty-three million, three hundred forty-four thousand, four hundred".