12131220 has 24 divisors (see below), whose sum is σ = 33967584. Its totient is φ = 3234976.

The previous prime is 12131219. The next prime is 12131257. The reversal of 12131220 is 2213121.

12131220 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 = 12131196 and 12131205.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 101034 + ... + 101153.

It is an arithmetic number, because the mean of its divisors is an integer number (1415316).

Almost surely, 2^12131220 is an apocalyptic number.

12131220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12131220 is an abundant number, since it is smaller than the sum of its proper divisors (21836364).

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

12131220 is a wasteful number, since it uses less digits than its factorization.

12131220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 202199 (or 202197 counting only the distinct ones).

The product of its (nonzero) digits is 24, while the sum is 12.

The square root of 12131220 is about 3482.9900947318. The cubic root of 12131220 is about 229.7743217980.

Adding to 12131220 its reverse (2213121), we get a palindrome (14344341).

The spelling of 12131220 in words is "twelve million, one hundred thirty-one thousand, two hundred twenty".