1121121000000 has 490 divisors, whose sum is σ = 4154439283434. Its totient is φ = 298944000000.

The previous prime is 1121120999939. The next prime is 1121121000001. The reversal of 1121121000000 is 1211211.

It is a happy number.

It can be written as a sum of positive squares in 7 ways, for example, as 1103205712896 + 17915287104 = 1050336^2 + 133848^2 .

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1121121000001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 69 ways as a sum of consecutive naturals, for example, 80993080 + ... + 81006920.

Almost surely, 2^{1121121000000} is an apocalyptic number.

1121121000000 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 1121121000000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2077219641717).

1121121000000 is an abundant number, since it is smaller than the sum of its proper divisors (3033318283434).

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

1121121000000 is an frugal number, since it uses more digits than its factorization.

1121121000000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13895 (or 13851 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 9.

Adding to 1121121000000 its reverse (1211211), we get a palindrome (1121122211211).

The spelling of 1121121000000 in words is "one trillion, one hundred twenty-one billion, one hundred twenty-one million", and thus it is an aban number.