21211200011100 has 144 divisors (see below), whose sum is σ = 66952092041856. Its totient is φ = 5141968416000.

The previous prime is 21211200011063. The next prime is 21211200011129. The reversal of 21211200011100 is 111000211212.

It is a Harshad number since it is a multiple of its sum of digits (12).

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 47 ways as a sum of consecutive naturals, for example, 170967090 + ... + 171091110.

It is an arithmetic number, because the mean of its divisors is an integer number (464945083624).

Almost surely, 2^{21211200011100} is an apocalyptic number.

21211200011100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21211200011100 is an abundant number, since it is smaller than the sum of its proper divisors (45740892030756).

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

21211200011100 is a wasteful number, since it uses less digits than its factorization.

21211200011100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 175876 (or 175869 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 12.

Adding to 21211200011100 its reverse (111000211212), we get a palindrome (21322200222312).

The spelling of 21211200011100 in words is "twenty-one trillion, two hundred eleven billion, two hundred million, eleven thousand, one hundred".