1213321111000 has 128 divisors (see below), whose sum is σ = 2939664312000. Its totient is φ = 468179712000.

The previous prime is 1213321110973. The next prime is 1213321111039. The reversal of 1213321111000 is 1111233121.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

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 31 ways as a sum of consecutive naturals, for example, 33941136 + ... + 33976864.

Almost surely, 2^{1213321111000} is an apocalyptic number.

1213321111000 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1213321111000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1469832156000).

1213321111000 is an abundant number, since it is smaller than the sum of its proper divisors (1726343201000).

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

1213321111000 is a wasteful number, since it uses less digits than its factorization.

1213321111000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36950 (or 36936 counting only the distinct ones).

The product of its (nonzero) digits is 36, while the sum is 16.

Adding to 1213321111000 its reverse (1111233121), we get a palindrome (1214432344121).

The spelling of 1213321111000 in words is "one trillion, two hundred thirteen billion, three hundred twenty-one million, one hundred eleven thousand".