142264021 has 2 divisors, whose sum is σ = 142264022. Its totient is φ = 142264020.

The previous prime is 142264019. The next prime is 142264027. The reversal of 142264021 is 120462241.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 127441521 + 14822500 = 11289^2 + 3850^2 .

It is an emirp because it is prime and its reverse (120462241) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 142264021 - 2¹ = 142264019 is a prime.

Together with 142264019, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 142263983 and 142264001.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (142264027) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 71132010 + 71132011.

It is an arithmetic number, because the mean of its divisors is an integer number (71132011).

Almost surely, 2^142264021 is an apocalyptic number.

It is an amenable number.

142264021 is a deficient number, since it is larger than the sum of its proper divisors (1).

142264021 is an equidigital number, since it uses as much as digits as its factorization.

142264021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 768, while the sum is 22.

The square root of 142264021 is about 11927.4482182904. The cubic root of 142264021 is about 522.0334836103.

The spelling of 142264021 in words is "one hundred forty-two million, two hundred sixty-four thousand, twenty-one".