1100021121220 has 96 divisors (see below), whose sum is σ = 2713564643328. Its totient is φ = 366726794112.

The previous prime is 1100021121211. The next prime is 1100021121239. The reversal of 1100021121220 is 221211200011.

It is a self number, because there is not a number n which added to its sum of digits gives 1100021121220.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 932757 + ... + 1752163.

It is an arithmetic number, because the mean of its divisors is an integer number (28266298368).

Almost surely, 2^{1100021121220} is an apocalyptic number.

1100021121220 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 1100021121220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1356782321664).

1100021121220 is an abundant number, since it is smaller than the sum of its proper divisors (1613543522108).

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

1100021121220 is a wasteful number, since it uses less digits than its factorization.

1100021121220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 819689 (or 819687 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 1100021121220 its reverse (221211200011), we get a palindrome (1321232321231).

The spelling of 1100021121220 in words is "one trillion, one hundred billion, twenty-one million, one hundred twenty-one thousand, two hundred twenty".