1221303120324 has 144 divisors (see below), whose sum is σ = 3493223294400. Its totient is φ = 330219638784.

The previous prime is 1221303120311. The next prime is 1221303120379. The reversal of 1221303120324 is 4230213031221.

It is a junction number, because it is equal to n+sod(n) for n = 1221303120294 and 1221303120303.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 10319952 + ... + 10437624.

It is an arithmetic number, because the mean of its divisors is an integer number (24258495100).

Almost surely, 2^{1221303120324} is an apocalyptic number.

1221303120324 is a gapful number since it is divisible by the number (14) 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 1221303120324, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1746611647200).

1221303120324 is an abundant number, since it is smaller than the sum of its proper divisors (2271920174076).

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

1221303120324 is a wasteful number, since it uses less digits than its factorization.

1221303120324 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 118642 (or 118633 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 24.

Adding to 1221303120324 its reverse (4230213031221), we get a palindrome (5451516151545).

The spelling of 1221303120324 in words is "one trillion, two hundred twenty-one billion, three hundred three million, one hundred twenty thousand, three hundred twenty-four".