136217855221 has 24 divisors (see below), whose sum is σ = 167804778816. Its totient is φ = 109872846720.

The previous prime is 136217855203. The next prime is 136217855227. The reversal of 136217855221 is 122558712631.

It is a de Polignac number, because none of the positive numbers 2^k-136217855221 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (136217855227) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 10498480 + ... + 10511446.

It is an arithmetic number, because the mean of its divisors is an integer number (6991865784).

Almost surely, 2^136217855221 is an apocalyptic number.

It is an amenable number.

136217855221 is a deficient number, since it is larger than the sum of its proper divisors (31586923595).

136217855221 is a wasteful number, since it uses less digits than its factorization.

136217855221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25609 (or 25602 counting only the distinct ones).

The product of its digits is 201600, while the sum is 43.

The spelling of 136217855221 in words is "one hundred thirty-six billion, two hundred seventeen million, eight hundred fifty-five thousand, two hundred twenty-one".