1101221220 has 48 divisors (see below), whose sum is σ = 3363732288. Its totient is φ = 266962560.

The previous prime is 1101221197. The next prime is 1101221311. The reversal of 1101221220 is 221221011.

1101221220 is digitally balanced in base 6, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a junction number, because it is equal to n+sod(n) for n = 1101221196 and 1101221205.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 833599 + ... + 834918.

It is an arithmetic number, because the mean of its divisors is an integer number (70077756).

Almost surely, 2^1101221220 is an apocalyptic number.

1101221220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1101221220 is an abundant number, since it is smaller than the sum of its proper divisors (2262511068).

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

1101221220 is a wasteful number, since it uses less digits than its factorization.

1101221220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1668540 (or 1668538 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 12.

The square root of 1101221220 is about 33184.6533807421. The cubic root of 1101221220 is about 1032.6619866348.

Adding to 1101221220 its reverse (221221011), we get a palindrome (1322442231).

The spelling of 1101221220 in words is "one billion, one hundred one million, two hundred twenty-one thousand, two hundred twenty".