1121021221100 has 144 divisors (see below), whose sum is σ = 2796871822080. Its totient is φ = 385713964800.

The previous prime is 1121021221051. The next prime is 1121021221127. The reversal of 1121021221100 is 11221201211.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 17168114 + ... + 17233286.

Almost surely, 2^{1121021221100} is an apocalyptic number.

1121021221100 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 1121021221100, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1398435911040).

1121021221100 is an abundant number, since it is smaller than the sum of its proper divisors (1675850600980).

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

1121021221100 is a wasteful number, since it uses less digits than its factorization.

1121021221100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66040 (or 66033 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 1121021221100 its reverse (11221201211), we get a palindrome (1132242422311).

The spelling of 1121021221100 in words is "one trillion, one hundred twenty-one billion, twenty-one million, two hundred twenty-one thousand, one hundred".