21002110221100 has 72 divisors (see below), whose sum is σ = 48259877295168. Its totient is φ = 7905949209600.

The previous prime is 21002110221067. The next prime is 21002110221109. The reversal of 21002110221100 is 112201120012.

It is not an unprimeable number, because it can be changed into a prime (21002110221109) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 18091165 + ... + 19217035.

It is an arithmetic number, because the mean of its divisors is an integer number (670276073544).

Almost surely, 2^{21002110221100} is an apocalyptic number.

21002110221100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21002110221100 is an abundant number, since it is smaller than the sum of its proper divisors (27257767074068).

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

21002110221100 is a wasteful number, since it uses less digits than its factorization.

21002110221100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1136875 (or 1136868 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 21002110221100 its reverse (112201120012), we get a palindrome (21114311341112).

The spelling of 21002110221100 in words is "twenty-one trillion, two billion, one hundred ten million, two hundred twenty-one thousand, one hundred".