142444021 has 2 divisors, whose sum is σ = 142444022. Its totient is φ = 142444020.

The previous prime is 142443989. The next prime is 142444051. The reversal of 142444021 is 120444241.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 119028100 + 23415921 = 10910^2 + 4839^2 .

It is a cyclic number.

It is not a de Polignac number, because 142444021 - 2⁵ = 142443989 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 142443983 and 142444001.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (142444051) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 71222010 + 71222011.

It is an arithmetic number, because the mean of its divisors is an integer number (71222011).

Almost surely, 2^142444021 is an apocalyptic number.

It is an amenable number.

142444021 is a deficient number, since it is larger than the sum of its proper divisors (1).

142444021 is an equidigital number, since it uses as much as digits as its factorization.

142444021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1024, while the sum is 22.

The square root of 142444021 is about 11934.9914537045. The cubic root of 142444021 is about 522.2535589884.

Adding to 142444021 its reverse (120444241), we get a palindrome (262888262).

The spelling of 142444021 in words is "one hundred forty-two million, four hundred forty-four thousand, twenty-one".