21002220202200 has 96 divisors (see below), whose sum is σ = 65108147544000. Its totient is φ = 5600483244160.

The previous prime is 21002220202111. The next prime is 21002220202247. The reversal of 21002220202200 is 220202220012.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 21002220202200.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 33347419 + ... + 33971381.

It is an arithmetic number, because the mean of its divisors is an integer number (678209870250).

Almost surely, 2^{21002220202200} is an apocalyptic number.

21002220202200 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21002220202200 is an abundant number, since it is smaller than the sum of its proper divisors (44105927341800).

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

21002220202200 is a wasteful number, since it uses less digits than its factorization.

21002220202200 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 680081 (or 680072 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 15.

Adding to 21002220202200 its reverse (220202220012), we get a palindrome (21222422422212).

The spelling of 21002220202200 in words is "twenty-one trillion, two billion, two hundred twenty million, two hundred two thousand, two hundred".