21337283736 has 72 divisors (see below), whose sum is σ = 59946885180. Its totient is φ = 7110281088.

The previous prime is 21337283719. The next prime is 21337283809. The reversal of 21337283736 is 63738273312.

It is a powerful number, because all its prime factors have an exponent greater than 1 and also an Achilles number because it is not a perfect power.

21337283736 is a `hidden beast` number, since 2 + 1 + 337 + 283 + 7 + 36 = 666.

It is a tau number, because it is divible by the number of its divisors (72).

It is a junction number, because it is equal to n+sod(n) for n = 21337283691 and 21337283700.

It is a congruent number.

It is an unprimeable number.

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 17 ways as a sum of consecutive naturals, for example, 6438816 + ... + 6442128.

Almost surely, 2^21337283736 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21337283736, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29973442590).

21337283736 is an abundant number, since it is smaller than the sum of its proper divisors (38609601444).

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

21337283736 is an frugal number, since it uses more digits than its factorization.

21337283736 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6647 (or 3318 counting only the distinct ones).

The product of its digits is 762048, while the sum is 45.

The spelling of 21337283736 in words is "twenty-one billion, three hundred thirty-seven million, two hundred eighty-three thousand, seven hundred thirty-six".