21200212110 has 192 divisors, whose sum is σ = 66652637184. Its totient is φ = 4263033600.

The previous prime is 21200212043. The next prime is 21200212123. The reversal of 21200212110 is 1121200212.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 480124 + ... + 522416.

It is an arithmetic number, because the mean of its divisors is an integer number (347149152).

Almost surely, 2^21200212110 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21200212110, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33326318592).

21200212110 is an abundant number, since it is smaller than the sum of its proper divisors (45452425074).

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

21200212110 is a wasteful number, since it uses less digits than its factorization.

21200212110 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42359 (or 42352 counting only the distinct ones).

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

Adding to 21200212110 its reverse (1121200212), we get a palindrome (22321412322).

The spelling of 21200212110 in words is "twenty-one billion, two hundred million, two hundred twelve thousand, one hundred ten".