21033302100 has 72 divisors (see below), whose sum is σ = 64059337440. Its totient is φ = 5313674880.

The previous prime is 21033302063. The next prime is 21033302117. The reversal of 21033302100 is 120333012.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 21033302100.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1839327 + ... + 1850726.

It is an arithmetic number, because the mean of its divisors is an integer number (889713020).

Almost surely, 2^21033302100 is an apocalyptic number.

21033302100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21033302100 is an abundant number, since it is smaller than the sum of its proper divisors (43026035340).

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

21033302100 is a wasteful number, since it uses less digits than its factorization.

21033302100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3690089 (or 3690082 counting only the distinct ones).

The product of its (nonzero) digits is 108, while the sum is 15.

Adding to 21033302100 its reverse (120333012), we get a palindrome (21153635112).

The spelling of 21033302100 in words is "twenty-one billion, thirty-three million, three hundred two thousand, one hundred".