136205121 has 8 divisors (see below), whose sum is σ = 195576640. Its totient is φ = 83818512.

The previous prime is 136205101. The next prime is 136205137. The reversal of 136205121 is 121502631.

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

It is not a de Polignac number, because 136205121 - 2⁵ = 136205089 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (136205101) 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, 1746181 + ... + 1746258.

It is an arithmetic number, because the mean of its divisors is an integer number (24447080).

Almost surely, 2^136205121 is an apocalyptic number.

It is an amenable number.

136205121 is a deficient number, since it is larger than the sum of its proper divisors (59371519).

136205121 is a wasteful number, since it uses less digits than its factorization.

136205121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3492455.

The product of its (nonzero) digits is 360, while the sum is 21.

The square root of 136205121 is about 11670.6949664534. The cubic root of 136205121 is about 514.5147293631.

Adding to 136205121 its reverse (121502631), we get a palindrome (257707752).

The spelling of 136205121 in words is "one hundred thirty-six million, two hundred five thousand, one hundred twenty-one".