142320421 has 2 divisors, whose sum is σ = 142320422. Its totient is φ = 142320420.

The previous prime is 142320407. The next prime is 142320443. The reversal of 142320421 is 124023241.

142320421 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., 72012196 + 70308225 = 8486^2 + 8385^2 .

It is a cyclic number.

It is not a de Polignac number, because 142320421 - 2¹³ = 142312229 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (142320461) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 71160210 + 71160211.

It is an arithmetic number, because the mean of its divisors is an integer number (71160211).

Almost surely, 2^142320421 is an apocalyptic number.

It is an amenable number.

142320421 is a deficient number, since it is larger than the sum of its proper divisors (1).

142320421 is an equidigital number, since it uses as much as digits as its factorization.

142320421 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 384, while the sum is 19.

The square root of 142320421 is about 11929.8122784895. The cubic root of 142320421 is about 522.1024605222.

Adding to 142320421 its reverse (124023241), we get a palindrome (266343662).

The spelling of 142320421 in words is "one hundred forty-two million, three hundred twenty thousand, four hundred twenty-one".