12121131220 has 48 divisors (see below), whose sum is σ = 27913890816. Its totient is φ = 4384592000.

The previous prime is 12121131199. The next prime is 12121131241. The reversal of 12121131220 is 2213112121.

12121131220 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (12121131199) and next prime (12121131241).

It is a junction number, because it is equal to n+sod(n) for n = 12121131194 and 12121131203.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 102211 + ... + 186250.

It is an arithmetic number, because the mean of its divisors is an integer number (581539392).

Almost surely, 2^12121131220 is an apocalyptic number.

12121131220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12121131220 is an abundant number, since it is smaller than the sum of its proper divisors (15792759596).

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

12121131220 is a wasteful number, since it uses less digits than its factorization.

12121131220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 288672 (or 288670 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 16.

Adding to 12121131220 its reverse (2213112121), we get a palindrome (14334243341).

It can be divided in two parts, 12121 and 131220, that added together give a palindrome (143341).

The spelling of 12121131220 in words is "twelve billion, one hundred twenty-one million, one hundred thirty-one thousand, two hundred twenty".