21001220202200 has 192 divisors, whose sum is σ = 58056931737600. Its totient is φ = 6913277683200.

The previous prime is 21001220202191. The next prime is 21001220202239. The reversal of 21001220202200 is 220202210012.

It is a Harshad number since it is a multiple of its sum of digits (14).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 3606686 + ... + 7416914.

It is an arithmetic number, because the mean of its divisors is an integer number (302379852800).

Almost surely, 2^{21001220202200} is an apocalyptic number.

21001220202200 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 21001220202200, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29028465868800).

21001220202200 is an abundant number, since it is smaller than the sum of its proper divisors (37055711535400).

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

21001220202200 is a wasteful number, since it uses less digits than its factorization.

21001220202200 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3810410 (or 3810401 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 14.

Adding to 21001220202200 its reverse (220202210012), we get a palindrome (21221422412212).

The spelling of 21001220202200 in words is "twenty-one trillion, one billion, two hundred twenty million, two hundred two thousand, two hundred".