142403021 has 4 divisors (see below), whose sum is σ = 147313500. Its totient is φ = 137492544.

The previous prime is 142403003. The next prime is 142403029. The reversal of 142403021 is 120304241.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 120304241 = 937 ⋅128393.

It can be written as a sum of positive squares in 2 ways, for example, as 52722121 + 89680900 = 7261^2 + 9470^2 .

It is a cyclic number.

It is not a de Polignac number, because 142403021 - 2¹⁰ = 142401997 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 (142403029) 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, 2455196 + ... + 2455253.

It is an arithmetic number, because the mean of its divisors is an integer number (36828375).

Almost surely, 2^142403021 is an apocalyptic number.

It is an amenable number.

142403021 is a deficient number, since it is larger than the sum of its proper divisors (4910479).

142403021 is an equidigital number, since it uses as much as digits as its factorization.

142403021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4910478.

The product of its (nonzero) digits is 192, while the sum is 17.

The square root of 142403021 is about 11933.2736916573. The cubic root of 142403021 is about 522.2034470204.

Adding to 142403021 its reverse (120304241), we get a palindrome (262707262).

The spelling of 142403021 in words is "one hundred forty-two million, four hundred three thousand, twenty-one".