21200212212100 has 36 divisors (see below), whose sum is σ = 46017300926464. Its totient is φ = 8477717986080.

The previous prime is 21200212212061. The next prime is 21200212212107. The reversal of 21200212212100 is 121221200212.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (21200212212107) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 29226144 + ... + 29942743.

Almost surely, 2^{21200212212100} is an apocalyptic number.

21200212212100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21200212212100 is an abundant number, since it is smaller than the sum of its proper divisors (24817088714364).

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

21200212212100 is a wasteful number, since it uses less digits than its factorization.

21200212212100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 59172484 (or 59172477 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 21200212212100 its reverse (121221200212), we get a palindrome (21321433412312).

The spelling of 21200212212100 in words is "twenty-one trillion, two hundred billion, two hundred twelve million, two hundred twelve thousand, one hundred".