142120243121 has 2 divisors, whose sum is σ = 142120243122. Its totient is φ = 142120243120.

The previous prime is 142120243099. The next prime is 142120243129. The reversal of 142120243121 is 121342021241.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 79036888225 + 63083354896 = 281135^2 + 251164^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-142120243121 is a prime.

It is not a weakly prime, because it can be changed into another prime (142120243129) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 71060121560 + 71060121561.

It is an arithmetic number, because the mean of its divisors is an integer number (71060121561).

Almost surely, 2^142120243121 is an apocalyptic number.

It is an amenable number.

142120243121 is a deficient number, since it is larger than the sum of its proper divisors (1).

142120243121 is an equidigital number, since it uses as much as digits as its factorization.

142120243121 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 768, while the sum is 23.

Adding to 142120243121 its reverse (121342021241), we get a palindrome (263462264362).

The spelling of 142120243121 in words is "one hundred forty-two billion, one hundred twenty million, two hundred forty-three thousand, one hundred twenty-one".