21210201020100 has 72 divisors (see below), whose sum is σ = 62864966572128. Its totient is φ = 5518101075200.

The previous prime is 21210201020089. The next prime is 21210201020119. The reversal of 21210201020100 is 102010201212.

It is a Harshad number since it is a multiple of its sum of digits (12).

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 23 ways as a sum of consecutive naturals, for example, 862190994 + ... + 862215593.

It is an arithmetic number, because the mean of its divisors is an integer number (873124535724).

Almost surely, 2^{21210201020100} is an apocalyptic number.

21210201020100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21210201020100 is an abundant number, since it is smaller than the sum of its proper divisors (41654765552028).

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

21210201020100 is a wasteful number, since it uses less digits than its factorization.

21210201020100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1724406645 (or 1724406638 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 12.

Adding to 21210201020100 its reverse (102010201212), we get a palindrome (21312211221312).

The spelling of 21210201020100 in words is "twenty-one trillion, two hundred ten billion, two hundred one million, twenty thousand, one hundred".