135424021 has 2 divisors, whose sum is σ = 135424022. Its totient is φ = 135424020.

The previous prime is 135424007. The next prime is 135424043. The reversal of 135424021 is 120424531.

It is an a-pointer prime, because the next prime (135424043) can be obtained adding 135424021 to its sum of digits (22).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 115799121 + 19624900 = 10761^2 + 4430^2 .

It is an emirp because it is prime and its reverse (120424531) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 135424021 - 2¹¹ = 135421973 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 135423983 and 135424001.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (135424721) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 67712010 + 67712011.

It is an arithmetic number, because the mean of its divisors is an integer number (67712011).

Almost surely, 2^135424021 is an apocalyptic number.

It is an amenable number.

135424021 is a deficient number, since it is larger than the sum of its proper divisors (1).

135424021 is an equidigital number, since it uses as much as digits as its factorization.

135424021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 960, while the sum is 22.

The square root of 135424021 is about 11637.1826916999. The cubic root of 135424021 is about 513.5293083838.

Adding to 135424021 its reverse (120424531), we get a palindrome (255848552).

The spelling of 135424021 in words is "one hundred thirty-five million, four hundred twenty-four thousand, twenty-one".