1101121121220 has 48 divisors (see below), whose sum is σ = 3264500268288. Its totient is φ = 276359810560.

The previous prime is 1101121121201. The next prime is 1101121121227. The reversal of 1101121121220 is 221211211011.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 1101121121220.

It is not an unprimeable number, because it can be changed into a prime (1101121121227) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 539764236 + ... + 539766275.

It is an arithmetic number, because the mean of its divisors is an integer number (68010422256).

Almost surely, 2^{1101121121220} is an apocalyptic number.

1101121121220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1101121121220 is an abundant number, since it is smaller than the sum of its proper divisors (2163379147068).

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

1101121121220 is a wasteful number, since it uses less digits than its factorization.

1101121121220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1079530540 (or 1079530538 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 15.

Adding to 1101121121220 its reverse (221211211011), we get a palindrome (1322332332231).

The spelling of 1101121121220 in words is "one trillion, one hundred one billion, one hundred twenty-one million, one hundred twenty-one thousand, two hundred twenty".