1221331200000 has 288 divisors, whose sum is σ = 4069913571360. Its totient is φ = 325683200000.

The previous prime is 1221331199969. The next prime is 1221331200053. The reversal of 1221331200000 is 21331221.

It is a Harshad number since it is a multiple of its sum of digits (15).

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, 19168195 + ... + 19231805.

It is an arithmetic number, because the mean of its divisors is an integer number (14131644345).

Almost surely, 2^{1221331200000} is an apocalyptic number.

1221331200000 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 1221331200000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2034956785680).

1221331200000 is an abundant number, since it is smaller than the sum of its proper divisors (2848582371360).

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

1221331200000 is an frugal number, since it uses more digits than its factorization.

1221331200000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 63661 (or 63621 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 15.

Adding to 1221331200000 its reverse (21331221), we get a palindrome (1221352531221).

The spelling of 1221331200000 in words is "one trillion, two hundred twenty-one billion, three hundred thirty-one million, two hundred thousand".