1211131120 has 40 divisors (see below), whose sum is σ = 2881373616. Its totient is φ = 473184768.

The previous prime is 1211131111. The next prime is 1211131123. The reversal of 1211131120 is 211311121.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (40).

It is a self number, because there is not a number n which added to its sum of digits gives 1211131120.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1211131123) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 172597 + ... + 179476.

Almost surely, 2^1211131120 is an apocalyptic number.

1211131120 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1211131120 is an abundant number, since it is smaller than the sum of its proper divisors (1670242496).

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

1211131120 is a wasteful number, since it uses less digits than its factorization.

1211131120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 352129 (or 352123 counting only the distinct ones).

The product of its (nonzero) digits is 12, while the sum is 13.

The square root of 1211131120 is about 34801.3091707769. The cubic root of 1211131120 is about 1065.9341785336.

Adding to 1211131120 its reverse (211311121), we get a palindrome (1422442241).

The spelling of 1211131120 in words is "one billion, two hundred eleven million, one hundred thirty-one thousand, one hundred twenty".