134242021 has 2 divisors, whose sum is σ = 134242022. Its totient is φ = 134242020.

The previous prime is 134242019. The next prime is 134242033. The reversal of 134242021 is 120242431.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 129640996 + 4601025 = 11386^2 + 2145^2 .

It is a cyclic number.

It is not a de Polignac number, because 134242021 - 2¹ = 134242019 is a prime.

Together with 134242019, it forms a pair of twin primes.

It is a nialpdrome in base 15.

It is a self number, because there is not a number n which added to its sum of digits gives 134242021.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (134242091) 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, 67121010 + 67121011.

It is an arithmetic number, because the mean of its divisors is an integer number (67121011).

Almost surely, 2^134242021 is an apocalyptic number.

It is an amenable number.

134242021 is a deficient number, since it is larger than the sum of its proper divisors (1).

134242021 is an equidigital number, since it uses as much as digits as its factorization.

134242021 is an odious number, because the sum of its binary digits is odd.

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

The square root of 134242021 is about 11586.2859018755. The cubic root of 134242021 is about 512.0308882834.

Adding to 134242021 its reverse (120242431), we get a palindrome (254484452).

The spelling of 134242021 in words is "one hundred thirty-four million, two hundred forty-two thousand, twenty-one".