135544200021 has 12 divisors (see below), whose sum is σ = 197686903648. Its totient is φ = 89485490664.

The previous prime is 135544200013. The next prime is 135544200023. The reversal of 135544200021 is 120002445531.

It is not a de Polignac number, because 135544200021 - 2³ = 135544200013 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (135544200023) 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, 73108135 + ... + 73109988.

Almost surely, 2^135544200021 is an apocalyptic number.

It is an amenable number.

135544200021 is a deficient number, since it is larger than the sum of its proper divisors (62142703627).

135544200021 is a wasteful number, since it uses less digits than its factorization.

135544200021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 146218232 (or 146218229 counting only the distinct ones).

The product of its (nonzero) digits is 4800, while the sum is 27.

Adding to 135544200021 its reverse (120002445531), we get a palindrome (255546645552).

The spelling of 135544200021 in words is "one hundred thirty-five billion, five hundred forty-four million, two hundred thousand, twenty-one".