135421908138 has 24 divisors (see below), whose sum is σ = 320088146976. Its totient is φ = 41036941800.

The previous prime is 135421908137. The next prime is 135421908157. The reversal of 135421908138 is 831809124531.

135421908138 is a `hidden beast` number, since 1 + 3 + 5 + 421 + 90 + 8 + 138 = 666.

It is a junction number, because it is equal to n+sod(n) for n = 135421908093 and 135421908102.

It is not an unprimeable number, because it can be changed into a prime (135421908133) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 341974318 + ... + 341974713.

It is an arithmetic number, because the mean of its divisors is an integer number (13337006124).

Almost surely, 2^135421908138 is an apocalyptic number.

135421908138 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

135421908138 is an abundant number, since it is smaller than the sum of its proper divisors (184666238838).

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

135421908138 is a wasteful number, since it uses less digits than its factorization.

135421908138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 683949050 (or 683949047 counting only the distinct ones).

The product of its (nonzero) digits is 207360, while the sum is 45.

The spelling of 135421908138 in words is "one hundred thirty-five billion, four hundred twenty-one million, nine hundred eight thousand, one hundred thirty-eight".