21330002000 has 80 divisors (see below), whose sum is σ = 54609910992. Its totient is φ = 8030105600.

The previous prime is 21330001999. The next prime is 21330002003. The reversal of 21330002000 is 20003312.

It can be written as a sum of positive squares in 8 ways, for example, as 5240601664 + 16089400336 = 72392^2 + 126844^2 .

It is a tau number, because it is divible by the number of its divisors (80).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21330002003) 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, 279677 + ... + 347676.

Almost surely, 2^21330002000 is an apocalyptic number.

21330002000 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21330002000 is an abundant number, since it is smaller than the sum of its proper divisors (33279908992).

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

21330002000 is a wasteful number, since it uses less digits than its factorization.

21330002000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 627393 (or 627377 counting only the distinct ones).

The product of its (nonzero) digits is 36, while the sum is 11.

Adding to 21330002000 its reverse (20003312), we get a palindrome (21350005312).

The spelling of 21330002000 in words is "twenty-one billion, three hundred thirty million, two thousand".