136821138 has 8 divisors (see below), whose sum is σ = 273642288. Its totient is φ = 45607044.

The previous prime is 136821137. The next prime is 136821149. The reversal of 136821138 is 831128631.

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

136821138 is an admirable number.

It is a junction number, because it is equal to n+sod(n) for n = 136821099 and 136821108.

It is not an unprimeable number, because it can be changed into a prime (136821133) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11401756 + ... + 11401767.

It is an arithmetic number, because the mean of its divisors is an integer number (34205286).

Almost surely, 2^136821138 is an apocalyptic number.

136821138 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

136821138 is a wasteful number, since it uses less digits than its factorization.

136821138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22803528.

The product of its digits is 6912, while the sum is 33.

The square root of 136821138 is about 11697.0568093004. The cubic root of 136821138 is about 515.2892308162.

Adding to 136821138 its reverse (831128631), we get a palindrome (967949769).

The spelling of 136821138 in words is "one hundred thirty-six million, eight hundred twenty-one thousand, one hundred thirty-eight".