21002033021100 has 36 divisors (see below), whose sum is σ = 60765882208584. Its totient is φ = 5600542138880.

The previous prime is 21002033021093. The next prime is 21002033021147. The reversal of 21002033021100 is 112033020012.

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 21002033021100.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 35003388069 + ... + 35003388668.

Almost surely, 2^{21002033021100} is an apocalyptic number.

21002033021100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21002033021100 is an abundant number, since it is smaller than the sum of its proper divisors (39763849187484).

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

21002033021100 is a wasteful number, since it uses less digits than its factorization.

21002033021100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 70006776754 (or 70006776747 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 15.

Adding to 21002033021100 its reverse (112033020012), we get a palindrome (21114066041112).

The spelling of 21002033021100 in words is "twenty-one trillion, two billion, thirty-three million, twenty-one thousand, one hundred".