131223201220 has 96 divisors (see below), whose sum is σ = 286256678400. Its totient is φ = 50503564800.

The previous prime is 131223201191. The next prime is 131223201247. The reversal of 131223201220 is 22102322131.

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 31 ways as a sum of consecutive naturals, for example, 10499175 + ... + 10511665.

It is an arithmetic number, because the mean of its divisors is an integer number (2981840400).

Almost surely, 2^131223201220 is an apocalyptic number.

131223201220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

131223201220 is an abundant number, since it is smaller than the sum of its proper divisors (155033477180).

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

131223201220 is a wasteful number, since it uses less digits than its factorization.

131223201220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12749 (or 12747 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 19.

Adding to 131223201220 its reverse (22102322131), we get a palindrome (153325523351).

The spelling of 131223201220 in words is "one hundred thirty-one billion, two hundred twenty-three million, two hundred one thousand, two hundred twenty".