135521420055 has 32 divisors (see below), whose sum is σ = 249593433600. Its totient is φ = 61506940032.

The previous prime is 135521420051. The next prime is 135521420087. The reversal of 135521420055 is 550024125531.

It is not a de Polignac number, because 135521420055 - 2² = 135521420051 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 135521419998 and 135521420025.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (135521420051) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4628140 + ... + 4657329.

It is an arithmetic number, because the mean of its divisors is an integer number (7799794800).

Almost surely, 2^135521420055 is an apocalyptic number.

135521420055 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

135521420055 is a deficient number, since it is larger than the sum of its proper divisors (114072013545).

135521420055 is a wasteful number, since it uses less digits than its factorization.

135521420055 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9285623.

The product of its (nonzero) digits is 30000, while the sum is 33.

Adding to 135521420055 its reverse (550024125531), we get a palindrome (685545545586).

The spelling of 135521420055 in words is "one hundred thirty-five billion, five hundred twenty-one million, four hundred twenty thousand, fifty-five".