1101212220 has 48 divisors (see below), whose sum is σ = 3085276320. Its totient is φ = 293477376.

The previous prime is 1101212207. The next prime is 1101212237. The reversal of 1101212220 is 222121011.

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 = 1101212196 and 1101212205.

It is a congruent number.

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, 114976 + ... + 124184.

It is an arithmetic number, because the mean of its divisors is an integer number (64276590).

Almost surely, 2^1101212220 is an apocalyptic number.

1101212220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1101212220 is an abundant number, since it is smaller than the sum of its proper divisors (1984064100).

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

1101212220 is a wasteful number, since it uses less digits than its factorization.

1101212220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11214 (or 11212 counting only the distinct ones).

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

The square root of 1101212220 is about 33184.5177756134. The cubic root of 1101212220 is about 1032.6591733995.

Adding to 1101212220 its reverse (222121011), we get a palindrome (1323333231).

It can be divided in two parts, 11012 and 12220, that added together give a palindrome (23232).

The spelling of 1101212220 in words is "one billion, one hundred one million, two hundred twelve thousand, two hundred twenty".