1121321223200 has 144 divisors (see below), whose sum is σ = 2773814277024. Its totient is φ = 442599014400.

The previous prime is 1121321223193. The next prime is 1121321223221. The reversal of 1121321223200 is 23221231211.

It is a super-2 number, since 2×1121321223200² (a number of 25 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 21973715 + ... + 22024685.

It is an arithmetic number, because the mean of its divisors is an integer number (19262599146).

Almost surely, 2^{1121321223200} is an apocalyptic number.

1121321223200 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 1121321223200, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1386907138512).

1121321223200 is an abundant number, since it is smaller than the sum of its proper divisors (1652493053824).

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

1121321223200 is a wasteful number, since it uses less digits than its factorization.

1121321223200 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51355 (or 51342 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 20.

Adding to 1121321223200 its reverse (23221231211), we get a palindrome (1144542454411).

The spelling of 1121321223200 in words is "one trillion, one hundred twenty-one billion, three hundred twenty-one million, two hundred twenty-three thousand, two hundred".