135840121356 has 24 divisors (see below), whose sum is σ = 323704120320. Its totient is φ = 44316635152.

The previous prime is 135840121343. The next prime is 135840121357. The reversal of 135840121356 is 653121048531.

It is not an unprimeable number, because it can be changed into a prime (135840121357) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 120425076 + ... + 120426203.

It is an arithmetic number, because the mean of its divisors is an integer number (13487671680).

Almost surely, 2^135840121356 is an apocalyptic number.

It is an amenable number.

135840121356 is an abundant number, since it is smaller than the sum of its proper divisors (187863998964).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

135840121356 is a wasteful number, since it uses less digits than its factorization.

135840121356 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 240851333 (or 240851331 counting only the distinct ones).

The product of its (nonzero) digits is 86400, while the sum is 39.

Adding to 135840121356 its reverse (653121048531), we get a palindrome (788961169887).

The spelling of 135840121356 in words is "one hundred thirty-five billion, eight hundred forty million, one hundred twenty-one thousand, three hundred fifty-six".