21353355135 has 128 divisors (see below), whose sum is σ = 46236303360. Its totient is φ = 9138019968.

The previous prime is 21353355119. The next prime is 21353355193. The reversal of 21353355135 is 53155335312.

21353355135 is a `hidden beast` number, since 2 + 135 + 3 + 3 + 5 + 513 + 5 = 666.

It is not a de Polignac number, because 21353355135 - 2⁴ = 21353355119 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21353355135.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 1011094 + ... + 1031996.

It is an arithmetic number, because the mean of its divisors is an integer number (361221120).

Almost surely, 2^21353355135 is an apocalyptic number.

21353355135 is an abundant number, since it is smaller than the sum of its proper divisors (24882948225).

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

21353355135 is a wasteful number, since it uses less digits than its factorization.

21353355135 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20994 (or 20988 counting only the distinct ones).

The product of its digits is 101250, while the sum is 36.

The spelling of 21353355135 in words is "twenty-one billion, three hundred fifty-three million, three hundred fifty-five thousand, one hundred thirty-five".