21210220102200 has 192 divisors, whose sum is σ = 69989966784000. Its totient is φ = 5298164720640.

The previous prime is 21210220102193. The next prime is 21210220102217. The reversal of 21210220102200 is 220102201212.

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 21210220102200.

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, 9437904 + ... + 11467103.

It is an arithmetic number, because the mean of its divisors is an integer number (364531077000).

Almost surely, 2^{21210220102200} is an apocalyptic number.

21210220102200 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21210220102200 is an abundant number, since it is smaller than the sum of its proper divisors (48779746681800).

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

21210220102200 is a wasteful number, since it uses less digits than its factorization.

21210220102200 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20905134 (or 20905125 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 15.

Adding to 21210220102200 its reverse (220102201212), we get a palindrome (21430322303412).

The spelling of 21210220102200 in words is "twenty-one trillion, two hundred ten billion, two hundred twenty million, one hundred two thousand, two hundred".