136161633221 has 4 divisors (see below), whose sum is σ = 136664074944. Its totient is φ = 135659191500.

The previous prime is 136161633131. The next prime is 136161633227. The reversal of 136161633221 is 122336161631.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 122336161631 = 19 ⋅6438745349.

It is a cyclic number.

It is not a de Polignac number, because 136161633221 - 2¹⁰ = 136161632197 is a prime.

It is a super-2 number, since 2×136161633221² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (136161633227) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 251220455 + ... + 251220996.

It is an arithmetic number, because the mean of its divisors is an integer number (34166018736).

Almost surely, 2^136161633221 is an apocalyptic number.

It is an amenable number.

136161633221 is a deficient number, since it is larger than the sum of its proper divisors (502441723).

136161633221 is an equidigital number, since it uses as much as digits as its factorization.

136161633221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 502441722.

The product of its digits is 23328, while the sum is 35.

Adding to 136161633221 its reverse (122336161631), we get a palindrome (258497794852).

The spelling of 136161633221 in words is "one hundred thirty-six billion, one hundred sixty-one million, six hundred thirty-three thousand, two hundred twenty-one".