1221242880000 has 1280 divisors, whose sum is σ = 4815281116800. Its totient is φ = 271319040000.

The previous prime is 1221242879993. The next prime is 1221242880019. The reversal of 1221242880000 is 882421221.

It is a tau number, because it is divible by the number of its divisors (1280).

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a self number, because there is not a number n which added to its sum of digits gives 1221242880000.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 8785919931 + ... + 8785920069.

Almost surely, 2^{1221242880000} is an apocalyptic number.

1221242880000 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 1221242880000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2407640558400).

1221242880000 is an abundant number, since it is smaller than the sum of its proper divisors (3594038236800).

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

1221242880000 is an equidigital number, since it uses as much as digits as its factorization.

1221242880000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 216 (or 173 counting only the distinct ones).

The product of its (nonzero) digits is 4096, while the sum is 30.

The spelling of 1221242880000 in words is "one trillion, two hundred twenty-one billion, two hundred forty-two million, eight hundred eighty thousand".