21336313812 has 72 divisors (see below), whose sum is σ = 54769612800. Its totient is φ = 6459932160.

The previous prime is 21336313799. The next prime is 21336313841. The reversal of 21336313812 is 21831363312.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1851364 + ... + 1862852.

Almost surely, 2^21336313812 is an apocalyptic number.

21336313812 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21336313812, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27384806400).

21336313812 is an abundant number, since it is smaller than the sum of its proper divisors (33433298988).

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

21336313812 is a wasteful number, since it uses less digits than its factorization.

21336313812 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12797 (or 12784 counting only the distinct ones).

The product of its digits is 15552, while the sum is 33.

The spelling of 21336313812 in words is "twenty-one billion, three hundred thirty-six million, three hundred thirteen thousand, eight hundred twelve".