1211111321000 has 256 divisors, whose sum is σ = 3304599068160. Its totient is φ = 406832025600.

The previous prime is 1211111320973. The next prime is 1211111321003. The reversal of 1211111321000 is 1231111121.

It is a Harshad number since it is a multiple of its sum of digits (14).

It is not an unprimeable number, because it can be changed into a prime (1211111321003) 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 63 ways as a sum of consecutive naturals, for example, 327591152 + ... + 327594848.

It is an arithmetic number, because the mean of its divisors is an integer number (12908590110).

Almost surely, 2^{1211111321000} is an apocalyptic number.

1211111321000 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 1211111321000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1652299534080).

1211111321000 is an abundant number, since it is smaller than the sum of its proper divisors (2093487747160).

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

1211111321000 is a wasteful number, since it uses less digits than its factorization.

1211111321000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4661 (or 4647 counting only the distinct ones).

The product of its (nonzero) digits is 12, while the sum is 14.

Adding to 1211111321000 its reverse (1231111121), we get a palindrome (1212342432121).

The spelling of 1211111321000 in words is "one trillion, two hundred eleven billion, one hundred eleven million, three hundred twenty-one thousand".