21337283808 has 36 divisors (see below), whose sum is σ = 60677901648. Its totient is φ = 7112427840.

The previous prime is 21337283719. The next prime is 21337283809. The reversal of 21337283808 is 80838273312.

21337283808 is a `hidden beast` number, since 213 + 37 + 28 + 380 + 8 = 666.

It is a tau number, because it is divible by the number of its divisors (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21337283809) 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 5 ways as a sum of consecutive naturals, for example, 37043608 + ... + 37044183.

It is an arithmetic number, because the mean of its divisors is an integer number (1685497268).

Almost surely, 2^21337283808 is an apocalyptic number.

It is an amenable number.

21337283808 is an abundant number, since it is smaller than the sum of its proper divisors (39340617840).

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

21337283808 is a wasteful number, since it uses less digits than its factorization.

21337283808 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 74087807 (or 74087796 counting only the distinct ones).

The product of its (nonzero) digits is 387072, while the sum is 45.

The spelling of 21337283808 in words is "twenty-one billion, three hundred thirty-seven million, two hundred eighty-three thousand, eight hundred eight".