1213331221200 has 120 divisors (see below), whose sum is σ = 4441947853888. Its totient is φ = 277332848640.

The previous prime is 1213331221189. The next prime is 1213331221229. The reversal of 1213331221200 is 21221333121.

It is a tau number, because it is divible by the number of its divisors (120).

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 72213697 + ... + 72230496.

Almost surely, 2^{1213331221200} is an apocalyptic number.

1213331221200 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1213331221200 is an abundant number, since it is smaller than the sum of its proper divisors (3228616632688).

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

1213331221200 is a wasteful number, since it uses less digits than its factorization.

1213331221200 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 144444221 (or 144444210 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 21.

Adding to 1213331221200 its reverse (21221333121), we get a palindrome (1234552554321).

The spelling of 1213331221200 in words is "one trillion, two hundred thirteen billion, three hundred thirty-one million, two hundred twenty-one thousand, two hundred".