1101221121220 has 144 divisors (see below), whose sum is σ = 2680463016000. Its totient is φ = 376817898240.

The previous prime is 1101221121197. The next prime is 1101221121229. The reversal of 1101221121220 is 221211221011.

It is a junction number, because it is equal to n+sod(n) for n = 1101221121194 and 1101221121203.

It is not an unprimeable number, because it can be changed into a prime (1101221121229) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 11787051 + ... + 11880109.

It is an arithmetic number, because the mean of its divisors is an integer number (18614326500).

Almost surely, 2^{1101221121220} is an apocalyptic number.

1101221121220 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 1101221121220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1340231508000).

1101221121220 is an abundant number, since it is smaller than the sum of its proper divisors (1579241894780).

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

1101221121220 is a wasteful number, since it uses less digits than its factorization.

1101221121220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 93266 (or 93245 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 1101221121220 its reverse (221211221011), we get a palindrome (1322432342231).

The spelling of 1101221121220 in words is "one trillion, one hundred one billion, two hundred twenty-one million, one hundred twenty-one thousand, two hundred twenty".