142544021 has 2 divisors, whose sum is σ = 142544022. Its totient is φ = 142544020.

The previous prime is 142543991. The next prime is 142544057. The reversal of 142544021 is 120445241.

142544021 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 141943396 + 600625 = 11914^2 + 775^2 .

It is a cyclic number.

It is not a de Polignac number, because 142544021 - 2⁶ = 142543957 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (142544071) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 71272010 + 71272011.

It is an arithmetic number, because the mean of its divisors is an integer number (71272011).

Almost surely, 2^142544021 is an apocalyptic number.

It is an amenable number.

142544021 is a deficient number, since it is larger than the sum of its proper divisors (1).

142544021 is an equidigital number, since it uses as much as digits as its factorization.

142544021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1280, while the sum is 23.

The square root of 142544021 is about 11939.1800807258. The cubic root of 142544021 is about 522.3757429852.

Adding to 142544021 its reverse (120445241), we get a palindrome (262989262).

The spelling of 142544021 in words is "one hundred forty-two million, five hundred forty-four thousand, twenty-one".