1211330120 has 128 divisors (see below), whose sum is σ = 3659523840. Its totient is φ = 348503040.

The previous prime is 1211330089. The next prime is 1211330129. The reversal of 1211330120 is 210331121.

It is a Harshad number since it is a multiple of its sum of digits (14).

It is a junction number, because it is equal to n+sod(n) for n = 1211330095 and 1211330104.

It is not an unprimeable number, because it can be changed into a prime (1211330129) by changing a digit.

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 31 ways as a sum of consecutive naturals, for example, 24914 + ... + 55166.

It is an arithmetic number, because the mean of its divisors is an integer number (28590030).

Almost surely, 2^1211330120 is an apocalyptic number.

1211330120 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1211330120, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1829761920).

1211330120 is an abundant number, since it is smaller than the sum of its proper divisors (2448193720).

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

1211330120 is a wasteful number, since it uses less digits than its factorization.

1211330120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30295 (or 30291 counting only the distinct ones).

The product of its (nonzero) digits is 36, while the sum is 14.

The square root of 1211330120 is about 34804.1681411868. The cubic root of 1211330120 is about 1065.9925562713.

Adding to 1211330120 its reverse (210331121), we get a palindrome (1421661241).

The spelling of 1211330120 in words is "one billion, two hundred eleven million, three hundred thirty thousand, one hundred twenty".