21102020200100 has 72 divisors (see below), whose sum is σ = 52398673978560. Its totient is φ = 7225900398720.

The previous prime is 21102020200067. The next prime is 21102020200127. The reversal of 21102020200100 is 100202020112.

It is a happy number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 18354110 + ... + 19469909.

Almost surely, 2^{21102020200100} is an apocalyptic number.

21102020200100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21102020200100 is an abundant number, since it is smaller than the sum of its proper divisors (31296653778460).

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

21102020200100 is a wasteful number, since it uses less digits than its factorization.

21102020200100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37824837 (or 37824830 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 11.

Adding to 21102020200100 its reverse (100202020112), we get a palindrome (21202222220212).

The spelling of 21102020200100 in words is "twenty-one trillion, one hundred two billion, twenty million, two hundred thousand, one hundred".