21212110011100 has 36 divisors (see below), whose sum is σ = 46035471838104. Its totient is φ = 8483886748480.

The previous prime is 21212110011083. The next prime is 21212110011139. The reversal of 21212110011100 is 111001121212.

It is a happy number.

It is a super-3 number, since 3×21212110011100³ (a number of 41 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 11074567 + ... + 12847966.

It is an arithmetic number, because the mean of its divisors is an integer number (1278763106614).

Almost surely, 2^{21212110011100} is an apocalyptic number.

21212110011100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21212110011100 is an abundant number, since it is smaller than the sum of its proper divisors (24823361827004).

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

21212110011100 is a wasteful number, since it uses less digits than its factorization.

21212110011100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23931414 (or 23931407 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 13.

Adding to 21212110011100 its reverse (111001121212), we get a palindrome (21323111132312).

The spelling of 21212110011100 in words is "twenty-one trillion, two hundred twelve billion, one hundred ten million, eleven thousand, one hundred".