131223101400242 has 4 divisors (see below), whose sum is σ = 196834652100366. Its totient is φ = 65611550700120.

The previous prime is 131223101400233. The next prime is 131223101400277. The reversal of 131223101400242 is 242004101322131.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 100511432240521 + 30711669159721 = 10025539^2 + 5541811^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32805775350059 + ... + 32805775350062.

Almost surely, 2^{131223101400242} is an apocalyptic number.

131223101400242 is a deficient number, since it is larger than the sum of its proper divisors (65611550700124).

131223101400242 is an equidigital number, since it uses as much as digits as its factorization.

131223101400242 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65611550700123.

The product of its (nonzero) digits is 2304, while the sum is 26.

Adding to 131223101400242 its reverse (242004101322131), we get a palindrome (373227202722373).

The spelling of 131223101400242 in words is "one hundred thirty-one trillion, two hundred twenty-three billion, one hundred one million, four hundred thousand, two hundred forty-two".