1311221121230 has 32 divisors (see below), whose sum is σ = 2499623548704. Its totient is φ = 493519574016.

The previous prime is 1311221121211. The next prime is 1311221121233. The reversal of 1311221121230 is 321211221131.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1311221121233) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 187607 + ... + 1630226.

It is an arithmetic number, because the mean of its divisors is an integer number (78113235897).

Almost surely, 2^{1311221121230} is an apocalyptic number.

1311221121230 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1311221121230 is a deficient number, since it is larger than the sum of its proper divisors (1188402427474).

1311221121230 is a wasteful number, since it uses less digits than its factorization.

1311221121230 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1822100.

The product of its (nonzero) digits is 144, while the sum is 20.

Adding to 1311221121230 its reverse (321211221131), we get a palindrome (1632432342361).

Subtracting from 1311221121230 its reverse (321211221131), we obtain a palindrome (990009900099).

The spelling of 1311221121230 in words is "one trillion, three hundred eleven billion, two hundred twenty-one million, one hundred twenty-one thousand, two hundred thirty".