142243121 has 8 divisors (see below), whose sum is σ = 143313000. Its totient is φ = 141177600.

The previous prime is 142243117. The next prime is 142243141. The reversal of 142243121 is 121342241.

142243121 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 89113600 + 53129521 = 9440^2 + 7289^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 142243121 - 2² = 142243117 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 142243093 and 142243102.

It is not an unprimeable number, because it can be changed into a prime (142243141) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 91055 + ... + 92603.

It is an arithmetic number, because the mean of its divisors is an integer number (17914125).

Almost surely, 2^142243121 is an apocalyptic number.

It is an amenable number.

142243121 is a deficient number, since it is larger than the sum of its proper divisors (1069879).

142243121 is a wasteful number, since it uses less digits than its factorization.

142243121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2179.

The product of its digits is 384, while the sum is 20.

The square root of 142243121 is about 11926.5720557082. The cubic root of 142243121 is about 522.0079183876.

Adding to 142243121 its reverse (121342241), we get a palindrome (263585362).

The spelling of 142243121 in words is "one hundred forty-two million, two hundred forty-three thousand, one hundred twenty-one".