131210220 has 24 divisors (see below), whose sum is σ = 367388784. Its totient is φ = 34989376.

The previous prime is 131210213. The next prime is 131210221. The reversal of 131210220 is 22012131.

It is a super-2 number, since 2×131210220² = 34432243664896800, which contains 22 as substring.

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 = 131210196 and 131210205.

It is not an unprimeable number, because it can be changed into a prime (131210221) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1093359 + ... + 1093478.

It is an arithmetic number, because the mean of its divisors is an integer number (15307866).

Almost surely, 2^131210220 is an apocalyptic number.

131210220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

131210220 is an abundant number, since it is smaller than the sum of its proper divisors (236178564).

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

131210220 is a wasteful number, since it uses less digits than its factorization.

131210220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2186849 (or 2186847 counting only the distinct ones).

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

The square root of 131210220 is about 11454.7029642850. The cubic root of 131210220 is about 508.1468306835.

Adding to 131210220 its reverse (22012131), we get a palindrome (153222351).

The spelling of 131210220 in words is "one hundred thirty-one million, two hundred ten thousand, two hundred twenty".