1221332331200 has 42 divisors (see below), whose sum is σ = 3005240871396. Its totient is φ = 488532931840.

The previous prime is 1221332331179. The next prime is 1221332331239. The reversal of 1221332331200 is 21332331221.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 381664754 + ... + 381667953.

Almost surely, 2^{1221332331200} is an apocalyptic number.

1221332331200 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1221332331200 is an abundant number, since it is smaller than the sum of its proper divisors (1783908540196).

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

1221332331200 is an equidigital number, since it uses as much as digits as its factorization.

1221332331200 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 763332729 (or 763332714 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 23.

Adding to 1221332331200 its reverse (21332331221), we get a palindrome (1242664662421).

The spelling of 1221332331200 in words is "one trillion, two hundred twenty-one billion, three hundred thirty-two million, three hundred thirty-one thousand, two hundred".