135123521320 has 32 divisors (see below), whose sum is σ = 320029394400. Its totient is φ = 51204702528.

The previous prime is 135123521303. The next prime is 135123521369. The reversal of 135123521320 is 23125321531.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 88896294 + ... + 88897813.

It is an arithmetic number, because the mean of its divisors is an integer number (10000918575).

Almost surely, 2^135123521320 is an apocalyptic number.

135123521320 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

135123521320 is an abundant number, since it is smaller than the sum of its proper divisors (184905873080).

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

135123521320 is a wasteful number, since it uses less digits than its factorization.

135123521320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 177794137 (or 177794133 counting only the distinct ones).

The product of its (nonzero) digits is 5400, while the sum is 28.

Adding to 135123521320 its reverse (23125321531), we get a palindrome (158248842851).

The spelling of 135123521320 in words is "one hundred thirty-five billion, one hundred twenty-three million, five hundred twenty-one thousand, three hundred twenty".