21236567733 has 12 divisors (see below), whose sum is σ = 30735314220. Its totient is φ = 14129894016.

The previous prime is 21236567717. The next prime is 21236567741. The reversal of 21236567733 is 33776563212.

21236567733 is a `hidden beast` number, since 2 + 12 + 3 + 6 + 567 + 73 + 3 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 14610282129 + 6626285604 = 120873^2 + 81402^2 .

It is not a de Polignac number, because 21236567733 - 2⁴ = 21236567717 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21236567533) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2313316 + ... + 2322477.

It is an arithmetic number, because the mean of its divisors is an integer number (2561276185).

Almost surely, 2^21236567733 is an apocalyptic number.

It is an amenable number.

21236567733 is a deficient number, since it is larger than the sum of its proper divisors (9498746487).

21236567733 is a wasteful number, since it uses less digits than its factorization.

21236567733 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4636308 (or 4636305 counting only the distinct ones).

The product of its digits is 952560, while the sum is 45.

The spelling of 21236567733 in words is "twenty-one billion, two hundred thirty-six million, five hundred sixty-seven thousand, seven hundred thirty-three".