142850021 has 2 divisors, whose sum is σ = 142850022. Its totient is φ = 142850020.

The previous prime is 142850017. The next prime is 142850039. The reversal of 142850021 is 120058241.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 138909796 + 3940225 = 11786^2 + 1985^2 .

It is a cyclic number.

It is not a de Polignac number, because 142850021 - 2² = 142850017 is a prime.

It is a super-2 number, since 2×142850021² = 40812256999400882, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (142850011) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 71425010 + 71425011.

It is an arithmetic number, because the mean of its divisors is an integer number (71425011).

Almost surely, 2^142850021 is an apocalyptic number.

It is an amenable number.

142850021 is a deficient number, since it is larger than the sum of its proper divisors (1).

142850021 is an equidigital number, since it uses as much as digits as its factorization.

142850021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 640, while the sum is 23.

The square root of 142850021 is about 11951.9881609714. The cubic root of 142850021 is about 522.7492714128.

The spelling of 142850021 in words is "one hundred forty-two million, eight hundred fifty thousand, twenty-one".