21330002100 has 72 divisors (see below), whose sum is σ = 67325253408. Its totient is φ = 5170908800.

The previous prime is 21330002093. The next prime is 21330002143. The reversal of 21330002100 is 120003312.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3228519 + ... + 3235118.

It is an arithmetic number, because the mean of its divisors is an integer number (935072964).

Almost surely, 2^21330002100 is an apocalyptic number.

21330002100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21330002100 is an abundant number, since it is smaller than the sum of its proper divisors (45995251308).

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

21330002100 is a wasteful number, since it uses less digits than its factorization.

21330002100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6463665 (or 6463658 counting only the distinct ones).

The product of its (nonzero) digits is 36, while the sum is 12.

Adding to 21330002100 its reverse (120003312), we get a palindrome (21450005412).

The spelling of 21330002100 in words is "twenty-one billion, three hundred thirty million, two thousand, one hundred".