142141121 has 4 divisors (see below), whose sum is σ = 142282452. Its totient is φ = 141999792.

The previous prime is 142141117. The next prime is 142141183. The reversal of 142141121 is 121141241.

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

It can be written as a sum of positive squares in 2 ways, for example, as 66259600 + 75881521 = 8140^2 + 8711^2 .

It is a cyclic number.

It is not a de Polignac number, because 142141121 - 2² = 142141117 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 142141121.

It is not an unprimeable number, because it can be changed into a prime (142141621) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 69146 + ... + 71171.

It is an arithmetic number, because the mean of its divisors is an integer number (35570613).

Almost surely, 2^142141121 is an apocalyptic number.

It is an amenable number.

142141121 is a deficient number, since it is larger than the sum of its proper divisors (141331).

142141121 is a wasteful number, since it uses less digits than its factorization.

142141121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 141330.

The product of its digits is 64, while the sum is 17.

The square root of 142141121 is about 11922.2951230038. The cubic root of 142141121 is about 521.8831143682.

Adding to 142141121 its reverse (121141241), we get a palindrome (263282362).

The spelling of 142141121 in words is "one hundred forty-two million, one hundred forty-one thousand, one hundred twenty-one".