142717021 has 2 divisors, whose sum is σ = 142717022. Its totient is φ = 142717020.

The previous prime is 142717019. The next prime is 142717027. The reversal of 142717021 is 120717241.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 115562500 + 27154521 = 10750^2 + 5211^2 .

It is a cyclic number.

It is not a de Polignac number, because 142717021 - 2¹ = 142717019 is a prime.

It is a super-2 number, since 2×142717021² = 40736296166228882, which contains 22 as substring.

Together with 142717019, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (142717027) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 71358510 + 71358511.

It is an arithmetic number, because the mean of its divisors is an integer number (71358511).

Almost surely, 2^142717021 is an apocalyptic number.

It is an amenable number.

142717021 is a deficient number, since it is larger than the sum of its proper divisors (1).

142717021 is an equidigital number, since it uses as much as digits as its factorization.

142717021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 784, while the sum is 25.

The square root of 142717021 is about 11946.4229374319. The cubic root of 142717021 is about 522.5869864257.

The spelling of 142717021 in words is "one hundred forty-two million, seven hundred seventeen thousand, twenty-one".