135840121355 has 8 divisors (see below), whose sum is σ = 163010259600. Its totient is φ = 108670687776.

The previous prime is 135840121343. The next prime is 135840121357. The reversal of 135840121355 is 553121048531.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-135840121355 is a prime.

It is a super-2 number, since 2×135840121355² (a number of 23 digits) contains 22 as substring.

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

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 450776 + ... + 689114.

It is an arithmetic number, because the mean of its divisors is an integer number (20376282450).

Almost surely, 2^135840121355 is an apocalyptic number.

135840121355 is a deficient number, since it is larger than the sum of its proper divisors (27170138245).

135840121355 is a wasteful number, since it uses less digits than its factorization.

135840121355 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 352333.

The product of its (nonzero) digits is 72000, while the sum is 38.

Adding to 135840121355 its reverse (553121048531), we get a palindrome (688961169886).

The spelling of 135840121355 in words is "one hundred thirty-five billion, eight hundred forty million, one hundred twenty-one thousand, three hundred fifty-five".