12121210120 has 64 divisors (see below), whose sum is σ = 29061186480. Its totient is φ = 4534173696.

The previous prime is 12121210109. The next prime is 12121210121. The reversal of 12121210120 is 2101212121.

It can be written as a sum of positive squares in 8 ways, for example, as 4440089956 + 7681120164 = 66634^2 + 87642^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 12121210120.

It is not an unprimeable number, because it can be changed into a prime (12121210121) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 49992 + ... + 163528.

Almost surely, 2^12121210120 is an apocalyptic number.

12121210120 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 12121210120, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (14530593240).

12121210120 is an abundant number, since it is smaller than the sum of its proper divisors (16939976360).

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

12121210120 is a wasteful number, since it uses less digits than its factorization.

12121210120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 113722 (or 113718 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 12121210120 its reverse (2101212121), we get a palindrome (14222422241).

It can be divided in two parts, 121212101 and 20, that added together give a palindrome (121212121).

The spelling of 12121210120 in words is "twelve billion, one hundred twenty-one million, two hundred ten thousand, one hundred twenty".