131221324242 has 32 divisors (see below), whose sum is σ = 308756059200. Its totient is φ = 41167473984.

The previous prime is 131221324159. The next prime is 131221324271. The reversal of 131221324242 is 242423122131.

131221324242 is a `hidden beast` number, since 1 + 312 + 2 + 1 + 324 + 24 + 2 = 666.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 71470392 + ... + 71472227.

It is an arithmetic number, because the mean of its divisors is an integer number (9648626850).

Almost surely, 2^131221324242 is an apocalyptic number.

131221324242 is an abundant number, since it is smaller than the sum of its proper divisors (177534734958).

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

131221324242 is a wasteful number, since it uses less digits than its factorization.

131221324242 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 142942647 (or 142942641 counting only the distinct ones).

The product of its digits is 4608, while the sum is 27.

Adding to 131221324242 its reverse (242423122131), we get a palindrome (373644446373).

The spelling of 131221324242 in words is "one hundred thirty-one billion, two hundred twenty-one million, three hundred twenty-four thousand, two hundred forty-two".