21033100100 has 36 divisors (see below), whose sum is σ = 47114151168. Its totient is φ = 8141844000.

The previous prime is 21033100093. The next prime is 21033100159. The reversal of 21033100100 is 100133012.

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 11 ways as a sum of consecutive naturals, for example, 3389336 + ... + 3395535.

Almost surely, 2^21033100100 is an apocalyptic number.

21033100100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21033100100 is an abundant number, since it is smaller than the sum of its proper divisors (26081051068).

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

21033100100 is a wasteful number, since it uses less digits than its factorization.

21033100100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6784916 (or 6784909 counting only the distinct ones).

The product of its (nonzero) digits is 18, while the sum is 11.

Adding to 21033100100 its reverse (100133012), we get a palindrome (21133233112).

The spelling of 21033100100 in words is "twenty-one billion, thirty-three million, one hundred thousand, one hundred".