21033311000312 has 64 divisors (see below), whose sum is σ = 42736477392000. Its totient is φ = 9647097692544.

The previous prime is 21033311000311. The next prime is 21033311000407. The reversal of 21033311000312 is 21300011333012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21033311000311) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 27981239 + ... + 28723097.

It is an arithmetic number, because the mean of its divisors is an integer number (667757459250).

Almost surely, 2^{21033311000312} 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 21033311000312, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21368238696000).

21033311000312 is an abundant number, since it is smaller than the sum of its proper divisors (21703166391688).

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

21033311000312 is a wasteful number, since it uses less digits than its factorization.

21033311000312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 743580 (or 743576 counting only the distinct ones).

The product of its (nonzero) digits is 324, while the sum is 20.

Adding to 21033311000312 its reverse (21300011333012), we get a palindrome (42333322333324).

The spelling of 21033311000312 in words is "twenty-one trillion, thirty-three billion, three hundred eleven million, three hundred twelve", and thus it is an aban number.