21010202202100 has 108 divisors (see below), whose sum is σ = 48296918760300. Its totient is φ = 7932159544320.

The previous prime is 21010202201993. The next prime is 21010202202139. The reversal of 21010202202100 is 120220201012.

It is a happy number.

It can be written as a sum of positive squares in 6 ways, for example, as 4502867024016 + 16507335178084 = 2121996^2 + 4062922^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 8629116 + ... + 10792684.

It is an arithmetic number, because the mean of its divisors is an integer number (447193692225).

Almost surely, 2^{21010202202100} is an apocalyptic number.

21010202202100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21010202202100, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24148459380150).

21010202202100 is an abundant number, since it is smaller than the sum of its proper divisors (27286716558200).

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

21010202202100 is a wasteful number, since it uses less digits than its factorization.

21010202202100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2163890 (or 2163864 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 13.

Adding to 21010202202100 its reverse (120220201012), we get a palindrome (21130422403112).

The spelling of 21010202202100 in words is "twenty-one trillion, ten billion, two hundred two million, two hundred two thousand, one hundred".