136512321 has 24 divisors (see below), whose sum is σ = 210608160. Its totient is φ = 78376320.

The previous prime is 136512319. The next prime is 136512347. The reversal of 136512321 is 123215631.

It is not a de Polignac number, because 136512321 - 2¹ = 136512319 is a prime.

It is a super-2 number, since 2×136512321² = 37271227569614082, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 136512291 and 136512300.

It is not an unprimeable number, because it can be changed into a prime (136512361) 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, 3000 + ... + 16793.

It is an arithmetic number, because the mean of its divisors is an integer number (8775340).

Almost surely, 2^136512321 is an apocalyptic number.

136512321 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

136512321 is a deficient number, since it is larger than the sum of its proper divisors (74095839).

136512321 is a wasteful number, since it uses less digits than its factorization.

136512321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19837 (or 19826 counting only the distinct ones).

The product of its digits is 1080, while the sum is 24.

The square root of 136512321 is about 11683.8487237725. The cubic root of 136512321 is about 514.9012548293.

Adding to 136512321 its reverse (123215631), we get a palindrome (259727952).

The spelling of 136512321 in words is "one hundred thirty-six million, five hundred twelve thousand, three hundred twenty-one".