1221133313320 has 16 divisors (see below), whose sum is σ = 2747549955060. Its totient is φ = 488453325312.

The previous prime is 1221133313303. The next prime is 1221133313329. The reversal of 1221133313320 is 233133311221.

It can be written as a sum of positive squares in 2 ways, for example, as 1154038844644 + 67094468676 = 1074262^2 + 259026^2 .

It is not an unprimeable number, because it can be changed into a prime (1221133313329) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15264166377 + ... + 15264166456.

Almost surely, 2^{1221133313320} is an apocalyptic number.

1221133313320 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1221133313320 is an abundant number, since it is smaller than the sum of its proper divisors (1526416641740).

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

1221133313320 is a wasteful number, since it uses less digits than its factorization.

1221133313320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30528332844 (or 30528332840 counting only the distinct ones).

The product of its (nonzero) digits is 1944, while the sum is 25.

Adding to 1221133313320 its reverse (233133311221), we get a palindrome (1454266624541).

The spelling of 1221133313320 in words is "one trillion, two hundred twenty-one billion, one hundred thirty-three million, three hundred thirteen thousand, three hundred twenty".