136340021 has 8 divisors (see below), whose sum is σ = 142534080. Its totient is φ = 130168192.

The previous prime is 136340003. The next prime is 136340023. The reversal of 136340021 is 120043631.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-136340021 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 136339975 and 136340002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (136340023) 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, 7685 + ... + 18213.

It is an arithmetic number, because the mean of its divisors is an integer number (17816760).

Almost surely, 2^136340021 is an apocalyptic number.

It is an amenable number.

136340021 is a deficient number, since it is larger than the sum of its proper divisors (6194059).

136340021 is a wasteful number, since it uses less digits than its factorization.

136340021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11115.

The product of its (nonzero) digits is 432, while the sum is 20.

The square root of 136340021 is about 11676.4729691804. The cubic root of 136340021 is about 514.6845348612.

Adding to 136340021 its reverse (120043631), we get a palindrome (256383652).

The spelling of 136340021 in words is "one hundred thirty-six million, three hundred forty thousand, twenty-one".