136065421 has 4 divisors (see below), whose sum is σ = 136880352. Its totient is φ = 135250492.

The previous prime is 136065383. The next prime is 136065427. The reversal of 136065421 is 124560631.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 124560631 = 13 ⋅9581587.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-136065421 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 136065421.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (136065427) 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 in 3 ways as a sum of consecutive naturals, for example, 407215 + ... + 407548.

It is an arithmetic number, because the mean of its divisors is an integer number (34220088).

Almost surely, 2^136065421 is an apocalyptic number.

It is an amenable number.

136065421 is a deficient number, since it is larger than the sum of its proper divisors (814931).

136065421 is an equidigital number, since it uses as much as digits as its factorization.

136065421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 814930.

The product of its (nonzero) digits is 4320, while the sum is 28.

The square root of 136065421 is about 11664.7083546911. The cubic root of 136065421 is about 514.3387636451.

The spelling of 136065421 in words is "one hundred thirty-six million, sixty-five thousand, four hundred twenty-one".