142144021 has 8 divisors (see below), whose sum is σ = 155361024. Its totient is φ = 129466560.

The previous prime is 142144003. The next prime is 142144031. The reversal of 142144021 is 120441241.

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

It is not a de Polignac number, because 142144021 - 2¹¹ = 142141973 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 142144021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (142144031) 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 7 ways as a sum of consecutive naturals, for example, 134335 + ... + 135388.

It is an arithmetic number, because the mean of its divisors is an integer number (19420128).

Almost surely, 2^142144021 is an apocalyptic number.

It is an amenable number.

142144021 is a deficient number, since it is larger than the sum of its proper divisors (13217003).

142144021 is a wasteful number, since it uses less digits than its factorization.

142144021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 269771.

The product of its (nonzero) digits is 256, while the sum is 19.

The square root of 142144021 is about 11922.4167432614. The cubic root of 142144021 is about 521.8866635423.

Adding to 142144021 its reverse (120441241), we get a palindrome (262585262).

The spelling of 142144021 in words is "one hundred forty-two million, one hundred forty-four thousand, twenty-one".