242131220171 has 4 divisors (see below), whose sum is σ = 242377539792. Its totient is φ = 241884900552.

The previous prime is 242131220081. The next prime is 242131220237. The reversal of 242131220171 is 171022131242.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 171022131242 = 2 ⋅85511065621.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-242131220171 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 242131220171.

It is not an unprimeable number, because it can be changed into a prime (242134220171) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 123158336 + ... + 123160301.

It is an arithmetic number, because the mean of its divisors is an integer number (60594384948).

Almost surely, 2^242131220171 is an apocalyptic number.

242131220171 is a deficient number, since it is larger than the sum of its proper divisors (246319621).

242131220171 is an equidigital number, since it uses as much as digits as its factorization.

242131220171 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 246319620.

The product of its (nonzero) digits is 1344, while the sum is 26.

The spelling of 242131220171 in words is "two hundred forty-two billion, one hundred thirty-one million, two hundred twenty thousand, one hundred seventy-one".