131212220 has 48 divisors (see below), whose sum is σ = 282544416. Its totient is φ = 51168000.

The previous prime is 131212199. The next prime is 131212223. The reversal of 131212220 is 22212131.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 131212195 and 131212204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131212223) 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, 159410 + ... + 160230.

It is an arithmetic number, because the mean of its divisors is an integer number (5886342).

Almost surely, 2^131212220 is an apocalyptic number.

131212220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

131212220 is an abundant number, since it is smaller than the sum of its proper divisors (151332196).

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

131212220 is a wasteful number, since it uses less digits than its factorization.

131212220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1022 (or 1020 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 14.

The square root of 131212220 is about 11454.7902643392. The cubic root of 131212220 is about 508.1494125162.

Adding to 131212220 its reverse (22212131), we get a palindrome (153424351).

The spelling of 131212220 in words is "one hundred thirty-one million, two hundred twelve thousand, two hundred twenty".