12120021120 has 128 divisors (see below), whose sum is σ = 40312391040. Its totient is φ = 3091472384.

The previous prime is 12120021107. The next prime is 12120021161. The reversal of 12120021120 is 2112002121.

It is a tau number, because it is divible by the number of its divisors (128).

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 = 12120021096 and 12120021105.

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, 93069 + ... + 181388.

It is an arithmetic number, because the mean of its divisors is an integer number (314940555).

Almost surely, 2^12120021120 is an apocalyptic number.

12120021120 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12120021120 is an abundant number, since it is smaller than the sum of its proper divisors (28192369920).

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

12120021120 is a wasteful number, since it uses less digits than its factorization.

12120021120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 274502 (or 274490 counting only the distinct ones).

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

Adding to 12120021120 its reverse (2112002121), we get a palindrome (14232023241).

The spelling of 12120021120 in words is "twelve billion, one hundred twenty million, twenty-one thousand, one hundred twenty".