1121212220 has 24 divisors (see below), whose sum is σ = 2493049104. Its totient is φ = 422103296.

The previous prime is 1121212219. The next prime is 1121212241. The reversal of 1121212220 is 222121211.

It is a junction number, because it is equal to n+sod(n) for n = 1121212195 and 1121212204.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1648502 + ... + 1649181.

It is an arithmetic number, because the mean of its divisors is an integer number (103877046).

Almost surely, 2^1121212220 is an apocalyptic number.

1121212220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1121212220 is an abundant number, since it is smaller than the sum of its proper divisors (1371836884).

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

1121212220 is a wasteful number, since it uses less digits than its factorization.

1121212220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3297709 (or 3297707 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 14.

The square root of 1121212220 is about 33484.5071637616. The cubic root of 1121212220 is about 1038.8733546355.

Adding to 1121212220 its reverse (222121211), we get a palindrome (1343333431).

It can be divided in two parts, 11212 and 12220, that added together give a palindrome (23432).

The spelling of 1121212220 in words is "one billion, one hundred twenty-one million, two hundred twelve thousand, two hundred twenty".