21333100012 has 72 divisors (see below), whose sum is σ = 46438697088. Its totient is φ = 8519616000.

The previous prime is 21333099971. The next prime is 21333100037. The reversal of 21333100012 is 21000133312.

It is a super-2 number, since 2×21333100012² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 304837 + ... + 368227.

It is an arithmetic number, because the mean of its divisors is an integer number (644981904).

Almost surely, 2^21333100012 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 21333100012, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23219348544).

21333100012 is an abundant number, since it is smaller than the sum of its proper divisors (25105597076).

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

21333100012 is a wasteful number, since it uses less digits than its factorization.

21333100012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 63527 (or 63518 counting only the distinct ones).

The product of its (nonzero) digits is 108, while the sum is 16.

Adding to 21333100012 its reverse (21000133312), we get a palindrome (42333233324).

The spelling of 21333100012 in words is "twenty-one billion, three hundred thirty-three million, one hundred thousand, twelve".