21033310012 has 24 divisors (see below), whose sum is σ = 43243309872. Its totient is φ = 8825164800.

The previous prime is 21033310009. The next prime is 21033310019. The reversal of 21033310012 is 21001333012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21033310019) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18385189 + ... + 18386332.

It is an arithmetic number, because the mean of its divisors is an integer number (1801804578).

Almost surely, 2^21033310012 is an apocalyptic number.

21033310012 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

21033310012 is an abundant number, since it is smaller than the sum of its proper divisors (22209999860).

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

21033310012 is a wasteful number, since it uses less digits than its factorization.

21033310012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36771549 (or 36771547 counting only the distinct ones).

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

Adding to 21033310012 its reverse (21001333012), we get a palindrome (42034643024).

The spelling of 21033310012 in words is "twenty-one billion, thirty-three million, three hundred ten thousand, twelve".