136605421 has 8 divisors (see below), whose sum is σ = 152254080. Its totient is φ = 121802688.

The previous prime is 136605401. The next prime is 136605451. The reversal of 136605421 is 124506631.

136605421 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 136605421 - 2⁵ = 136605389 is a prime.

It is a super-2 number, since 2×136605421² = 37322082093174482, which contains 22 as substring.

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 136605421.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (136605401) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 211141 + ... + 211786.

It is an arithmetic number, because the mean of its divisors is an integer number (19031760).

Almost surely, 2^136605421 is an apocalyptic number.

It is an amenable number.

136605421 is a deficient number, since it is larger than the sum of its proper divisors (15648659).

136605421 is a wasteful number, since it uses less digits than its factorization.

136605421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 422963.

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

The square root of 136605421 is about 11687.8321770977. The cubic root of 136605421 is about 515.0182806846.

It can be divided in two parts, 136605 and 421, that added together give a triangular number (137026 = T₅₂₃).

The spelling of 136605421 in words is "one hundred thirty-six million, six hundred five thousand, four hundred twenty-one".