136121521 has 8 divisors (see below), whose sum is σ = 143161344. Its totient is φ = 129175200.

The previous prime is 136121519. The next prime is 136121569. The reversal of 136121521 is 125121631.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 136121521 - 2¹ = 136121519 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 136121492 and 136121501.

It is not an unprimeable number, because it can be changed into a prime (136121581) 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 7 ways as a sum of consecutive naturals, for example, 20380 + ... + 26221.

It is an arithmetic number, because the mean of its divisors is an integer number (17895168).

Almost surely, 2^136121521 is an apocalyptic number.

It is an amenable number.

136121521 is a deficient number, since it is larger than the sum of its proper divisors (7039823).

136121521 is a wasteful number, since it uses less digits than its factorization.

136121521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46751.

The product of its digits is 360, while the sum is 22.

The square root of 136121521 is about 11667.1127962320. The cubic root of 136121521 is about 514.4094415092.

The spelling of 136121521 in words is "one hundred thirty-six million, one hundred twenty-one thousand, five hundred twenty-one".