135435210021 has 48 divisors (see below), whose sum is σ = 201373945344. Its totient is φ = 87665098752.

The previous prime is 135435210007. The next prime is 135435210047. The reversal of 135435210021 is 120012534531.

135435210021 is a `hidden beast` number, since 13 + 5 + 435 + 210 + 0 + 2 + 1 = 666.

It is not a de Polignac number, because 135435210021 - 2¹⁴ = 135435193637 is a prime.

It is a super-2 number, since 2×135435210021² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (135435218021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 61365100 + ... + 61367306.

It is an arithmetic number, because the mean of its divisors is an integer number (4195290528).

Almost surely, 2^135435210021 is an apocalyptic number.

It is an amenable number.

135435210021 is a deficient number, since it is larger than the sum of its proper divisors (65938735323).

135435210021 is a wasteful number, since it uses less digits than its factorization.

135435210021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3130 (or 3127 counting only the distinct ones).

The product of its (nonzero) digits is 3600, while the sum is 27.

Adding to 135435210021 its reverse (120012534531), we get a palindrome (255447744552).

The spelling of 135435210021 in words is "one hundred thirty-five billion, four hundred thirty-five million, two hundred ten thousand, twenty-one".