1231111221200 has 180 divisors, whose sum is σ = 3551632002432. Its totient is φ = 408479097600.

The previous prime is 1231111221167. The next prime is 1231111221203. The reversal of 1231111221200 is 21221111321.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1231111221203) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 405494 + ... + 1620693.

Almost surely, 2^{1231111221200} is an apocalyptic number.

1231111221200 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1231111221200 is an abundant number, since it is smaller than the sum of its proper divisors (2320520781232).

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

1231111221200 is a wasteful number, since it uses less digits than its factorization.

1231111221200 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2026250 (or 2026232 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 17.

Adding to 1231111221200 its reverse (21221111321), we get a palindrome (1252332332521).

The spelling of 1231111221200 in words is "one trillion, two hundred thirty-one billion, one hundred eleven million, two hundred twenty-one thousand, two hundred".