1221121340000 has 120 divisors (see below), whose sum is σ = 3004970882760. Its totient is φ = 488313728000.

The previous prime is 1221121339981. The next prime is 1221121340011. The reversal of 1221121340000 is 431211221.

It is a super-2 number, since 2×1221121340000² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 105454211 + ... + 105465789.

It is an arithmetic number, because the mean of its divisors is an integer number (25041424023).

Almost surely, 2^{1221121340000} is an apocalyptic number.

1221121340000 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 1221121340000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1502485441380).

1221121340000 is an abundant number, since it is smaller than the sum of its proper divisors (1783849542760).

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

1221121340000 is an equidigital number, since it uses as much as digits as its factorization.

1221121340000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16882 (or 16859 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 17.

Adding to 1221121340000 its reverse (431211221), we get a palindrome (1221552551221).

The spelling of 1221121340000 in words is "one trillion, two hundred twenty-one billion, one hundred twenty-one million, three hundred forty thousand".