136135421 has 2 divisors, whose sum is σ = 136135422. Its totient is φ = 136135420.

The previous prime is 136135403. The next prime is 136135451. The reversal of 136135421 is 124531631.

136135421 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 128572921 + 7562500 = 11339^2 + 2750^2 .

It is a cyclic number.

It is not a de Polignac number, because 136135421 - 2²⁶ = 69026557 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (136135451) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 68067710 + 68067711.

It is an arithmetic number, because the mean of its divisors is an integer number (68067711).

Almost surely, 2^136135421 is an apocalyptic number.

It is an amenable number.

136135421 is a deficient number, since it is larger than the sum of its proper divisors (1).

136135421 is an equidigital number, since it uses as much as digits as its factorization.

136135421 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2160, while the sum is 26.

The square root of 136135421 is about 11667.7084725322. The cubic root of 136135421 is about 514.4269504914.

The spelling of 136135421 in words is "one hundred thirty-six million, one hundred thirty-five thousand, four hundred twenty-one".