21101112221211 has 48 divisors (see below), whose sum is σ = 34468041673728. Its totient is φ = 12326627131200.

The previous prime is 21101112221159. The next prime is 21101112221227. The reversal of 21101112221211 is 11212221110112.

It is a happy number.

21101112221211 is a `hidden beast` number, since 21 + 101 + 112 + 221 + 211 = 666.

It is not a de Polignac number, because 21101112221211 - 2¹¹ = 21101112219163 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21101112221251) by changing a digit.

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, 26526795 + ... + 27310676.

It is an arithmetic number, because the mean of its divisors is an integer number (718084201536).

Almost surely, 2^{21101112221211} is an apocalyptic number.

21101112221211 is a deficient number, since it is larger than the sum of its proper divisors (13366929452517).

21101112221211 is a wasteful number, since it uses less digits than its factorization.

21101112221211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53837632 (or 53837629 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 18.

Adding to 21101112221211 its reverse (11212221110112), we get a palindrome (32313333331323).

The spelling of 21101112221211 in words is "twenty-one trillion, one hundred one billion, one hundred twelve million, two hundred twenty-one thousand, two hundred eleven".