21100221100212 has 48 divisors (see below), whose sum is σ = 50385585761280. Its totient is φ = 6868917161568.

The previous prime is 21100221100207. The next prime is 21100221100243. The reversal of 21100221100212 is 21200112200112.

It is a junction number, because it is equal to n+sod(n) for n = 21100221100191 and 21100221100200.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1107733 + ... + 6589955.

It is an arithmetic number, because the mean of its divisors is an integer number (1049699703360).

Almost surely, 2^{21100221100212} is an apocalyptic number.

It is an amenable number.

21100221100212 is an abundant number, since it is smaller than the sum of its proper divisors (29285364661068).

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

21100221100212 is a wasteful number, since it uses less digits than its factorization.

21100221100212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5489732 (or 5489730 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 21100221100212 its reverse (21200112200112), we get a palindrome (42300333300324).

The spelling of 21100221100212 in words is "twenty-one trillion, one hundred billion, two hundred twenty-one million, one hundred thousand, two hundred twelve".