142039321 has 2 divisors, whose sum is σ = 142039322. Its totient is φ = 142039320.

The previous prime is 142039309. The next prime is 142039327. The reversal of 142039321 is 123930241.

142039321 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 137733696 + 4305625 = 11736^2 + 2075^2 .

It is an emirp because it is prime and its reverse (123930241) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 142039321 - 2²¹ = 139942169 is a prime.

It is not a weakly prime, because it can be changed into another prime (142039327) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 71019660 + 71019661.

It is an arithmetic number, because the mean of its divisors is an integer number (71019661).

Almost surely, 2^142039321 is an apocalyptic number.

It is an amenable number.

142039321 is a deficient number, since it is larger than the sum of its proper divisors (1).

142039321 is an equidigital number, since it uses as much as digits as its factorization.

142039321 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1296, while the sum is 25.

The square root of 142039321 is about 11918.0250461224. The cubic root of 142039321 is about 521.7584955178.

Adding to 142039321 its reverse (123930241), we get a palindrome (265969562).

The spelling of 142039321 in words is "one hundred forty-two million, thirty-nine thousand, three hundred twenty-one".