135121431345 has 16 divisors (see below), whose sum is σ = 217388738112. Its totient is φ = 71666614080.

The previous prime is 135121431311. The next prime is 135121431353. The reversal of 135121431345 is 543134121531.

It is not a de Polignac number, because 135121431345 - 2⁸ = 135121431089 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 24881527 + ... + 24886956.

It is an arithmetic number, because the mean of its divisors is an integer number (13586796132).

Almost surely, 2^135121431345 is an apocalyptic number.

135121431345 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

135121431345 is a deficient number, since it is larger than the sum of its proper divisors (82267306767).

135121431345 is a wasteful number, since it uses less digits than its factorization.

135121431345 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49768672.

The product of its digits is 21600, while the sum is 33.

Adding to 135121431345 its reverse (543134121531), we get a palindrome (678255552876).

The spelling of 135121431345 in words is "one hundred thirty-five billion, one hundred twenty-one million, four hundred thirty-one thousand, three hundred forty-five".