142320021 has 16 divisors (see below), whose sum is σ = 199065600. Its totient is φ = 90271280.

The previous prime is 142320011. The next prime is 142320041. The reversal of 142320021 is 120023241.

142320021 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 142320021 - 2¹⁰ = 142318997 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (142320011) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7780 + ... + 18578.

It is an arithmetic number, because the mean of its divisors is an integer number (12441600).

Almost surely, 2^142320021 is an apocalyptic number.

It is an amenable number.

142320021 is a deficient number, since it is larger than the sum of its proper divisors (56745579).

142320021 is a wasteful number, since it uses less digits than its factorization.

142320021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11016.

The product of its (nonzero) digits is 96, while the sum is 15.

The square root of 142320021 is about 11929.7955137546. The cubic root of 142320021 is about 522.1019713884.

Adding to 142320021 its reverse (120023241), we get a palindrome (262343262).

The spelling of 142320021 in words is "one hundred forty-two million, three hundred twenty thousand, twenty-one".