135521420056 has 48 divisors (see below), whose sum is σ = 279351311400. Its totient is φ = 61589975040.

The previous prime is 135521420051. The next prime is 135521420087. The reversal of 135521420056 is 650024125531.

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 pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 9162475 + ... + 9177253.

Almost surely, 2^135521420056 is an apocalyptic number.

It is an amenable number.

135521420056 is an abundant number, since it is smaller than the sum of its proper divisors (143829891344).

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

135521420056 is a wasteful number, since it uses less digits than its factorization.

135521420056 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24280 (or 24265 counting only the distinct ones).

The product of its (nonzero) digits is 36000, while the sum is 34.

Adding to 135521420056 its reverse (650024125531), we get a palindrome (785545545587).

The spelling of 135521420056 in words is "one hundred thirty-five billion, five hundred twenty-one million, four hundred twenty thousand, fifty-six".