142135421 has 4 divisors (see below), whose sum is σ = 143089500. Its totient is φ = 141181344.

The previous prime is 142135373. The next prime is 142135459. The reversal of 142135421 is 124531241.

142135421 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 124531241 = 59 ⋅2110699.

It can be written as a sum of positive squares in 2 ways, for example, as 61387225 + 80748196 = 7835^2 + 8986^2 .

It is a cyclic number.

It is not a de Polignac number, because 142135421 - 2¹⁰ = 142134397 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (142135471) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 476816 + ... + 477113.

It is an arithmetic number, because the mean of its divisors is an integer number (35772375).

Almost surely, 2^142135421 is an apocalyptic number.

It is an amenable number.

142135421 is a deficient number, since it is larger than the sum of its proper divisors (954079).

142135421 is an equidigital number, since it uses as much as digits as its factorization.

142135421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 954078.

The product of its digits is 960, while the sum is 23.

The square root of 142135421 is about 11922.0560726747. The cubic root of 142135421 is about 521.8761382647.

Adding to 142135421 its reverse (124531241), we get a palindrome (266666662).

The spelling of 142135421 in words is "one hundred forty-two million, one hundred thirty-five thousand, four hundred twenty-one".