1216201303320 has 128 divisors (see below), whose sum is σ = 3736984204800. Its totient is φ = 316478582784.

The previous prime is 1216201303319. The next prime is 1216201303321. The reversal of 1216201303320 is 233031026121.

It is an interprime number because it is at equal distance from previous prime (1216201303319) and next prime (1216201303321).

It is a super-2 number, since 2×1216201303320² (a number of 25 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1216201303321) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 5374216 + ... + 5595944.

It is an arithmetic number, because the mean of its divisors is an integer number (29195189100).

Almost surely, 2^{1216201303320} is an apocalyptic number.

1216201303320 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 1216201303320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1868492102400).

1216201303320 is an abundant number, since it is smaller than the sum of its proper divisors (2520782901480).

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

1216201303320 is a wasteful number, since it uses less digits than its factorization.

1216201303320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 222849 (or 222845 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 24.

Adding to 1216201303320 its reverse (233031026121), we get a palindrome (1449232329441).

The spelling of 1216201303320 in words is "one trillion, two hundred sixteen billion, two hundred one million, three hundred three thousand, three hundred twenty".