135521455420 has 48 divisors (see below), whose sum is σ = 322617889440. Its totient is φ = 47405074176.

The previous prime is 135521455409. The next prime is 135521455427. The reversal of 135521455420 is 24554125531.

It is a self number, because there is not a number n which added to its sum of digits gives 135521455420.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (135521455427) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13711807 + ... + 13721686.

It is an arithmetic number, because the mean of its divisors is an integer number (6721206030).

Almost surely, 2^135521455420 is an apocalyptic number.

135521455420 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

135521455420 is an abundant number, since it is smaller than the sum of its proper divisors (187096434020).

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

135521455420 is a wasteful number, since it uses less digits than its factorization.

135521455420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27433534 (or 27433532 counting only the distinct ones).

The product of its (nonzero) digits is 120000, while the sum is 37.

The spelling of 135521455420 in words is "one hundred thirty-five billion, five hundred twenty-one million, four hundred fifty-five thousand, four hundred twenty".