21100212222200 has 96 divisors (see below), whose sum is σ = 51277281660000. Its totient is φ = 8059509596160.

The previous prime is 21100212222181. The next prime is 21100212222289. The reversal of 21100212222200 is 222221200112.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1139825 + ... + 6595424.

It is an arithmetic number, because the mean of its divisors is an integer number (534138350625).

Almost surely, 2^{21100212222200} is an apocalyptic number.

21100212222200 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21100212222200 is an abundant number, since it is smaller than the sum of its proper divisors (30177069437800).

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

21100212222200 is a wasteful number, since it uses less digits than its factorization.

21100212222200 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7735881 (or 7735872 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 17.

Adding to 21100212222200 its reverse (222221200112), we get a palindrome (21322433422312).

The spelling of 21100212222200 in words is "twenty-one trillion, one hundred billion, two hundred twelve million, two hundred twenty-two thousand, two hundred".