21336723135 has 96 divisors (see below), whose sum is σ = 47204451840. Its totient is φ = 9003581568.

The previous prime is 21336723097. The next prime is 21336723157. The reversal of 21336723135 is 53132763312.

21336723135 is a `hidden beast` number, since 2 + 1 + 336 + 7 + 2 + 313 + 5 = 666.

It is not a de Polignac number, because 21336723135 - 2¹⁴ = 21336706751 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21336723135.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 14076 + ... + 207054.

It is an arithmetic number, because the mean of its divisors is an integer number (491713040).

Almost surely, 2^21336723135 is an apocalyptic number.

21336723135 is an abundant number, since it is smaller than the sum of its proper divisors (25867728705).

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

21336723135 is a wasteful number, since it uses less digits than its factorization.

21336723135 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 193019 (or 193007 counting only the distinct ones).

The product of its digits is 68040, while the sum is 36.

The spelling of 21336723135 in words is "twenty-one billion, three hundred thirty-six million, seven hundred twenty-three thousand, one hundred thirty-five".