142405421 has 2 divisors, whose sum is σ = 142405422. Its totient is φ = 142405420.

The previous prime is 142405411. The next prime is 142405427. The reversal of 142405421 is 124504241.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 111724900 + 30680521 = 10570^2 + 5539^2 .

It is an emirp because it is prime and its reverse (124504241) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-142405421 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (142405427) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 71202710 + 71202711.

It is an arithmetic number, because the mean of its divisors is an integer number (71202711).

Almost surely, 2^142405421 is an apocalyptic number.

It is an amenable number.

142405421 is a deficient number, since it is larger than the sum of its proper divisors (1).

142405421 is an equidigital number, since it uses as much as digits as its factorization.

142405421 is an odious number, because the sum of its binary digits is odd.

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

The square root of 142405421 is about 11933.3742503954. The cubic root of 142405421 is about 522.2063806690.

Adding to 142405421 its reverse (124504241), we get a palindrome (266909662).

The spelling of 142405421 in words is "one hundred forty-two million, four hundred five thousand, four hundred twenty-one".