21536343306 has 36 divisors (see below), whose sum is σ = 47828002326. Its totient is φ = 7003679040.

The previous prime is 21536343289. The next prime is 21536343373. The reversal of 21536343306 is 60334363512.

21536343306 is a `hidden beast` number, since 2 + 1 + 5 + 3 + 6 + 343 + 306 = 666.

It can be written as a sum of positive squares in 3 ways, for example, as 2554392681 + 18981950625 = 50541^2 + 137775^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 325621 + ... + 386136.

Almost surely, 2^21536343306 is an apocalyptic number.

21536343306 is an abundant number, since it is smaller than the sum of its proper divisors (26291659020).

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

21536343306 is a wasteful number, since it uses less digits than its factorization.

21536343306 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 711847 (or 711803 counting only the distinct ones).

The product of its (nonzero) digits is 116640, while the sum is 36.

The spelling of 21536343306 in words is "twenty-one billion, five hundred thirty-six million, three hundred forty-three thousand, three hundred six".