142003021 has 4 divisors (see below), whose sum is σ = 142050844. Its totient is φ = 141955200.

The previous prime is 142003019. The next prime is 142003051. The reversal of 142003021 is 120300241.

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 53436100 + 88566921 = 7310^2 + 9411^2 .

It is a cyclic number.

It is not a de Polignac number, because 142003021 - 2¹ = 142003019 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 142002992 and 142003010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (142003051) 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, 19140 + ... + 25501.

It is an arithmetic number, because the mean of its divisors is an integer number (35512711).

Almost surely, 2^142003021 is an apocalyptic number.

It is an amenable number.

142003021 is a deficient number, since it is larger than the sum of its proper divisors (47823).

142003021 is an equidigital number, since it uses as much as digits as its factorization.

142003021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47822.

The product of its (nonzero) digits is 48, while the sum is 13.

The square root of 142003021 is about 11916.5020454830. The cubic root of 142003021 is about 521.7140443360.

Adding to 142003021 its reverse (120300241), we get a palindrome (262303262).

The spelling of 142003021 in words is "one hundred forty-two million, three thousand, twenty-one".