21221102112111 has 48 divisors (see below), whose sum is σ = 34559340248160. Its totient is φ = 12860237174400.

The previous prime is 21221102112107. The next prime is 21221102112121. The reversal of 21221102112111 is 11121120112212.

It is a happy number.

21221102112111 is a `hidden beast` number, since 21 + 221 + 1 + 0 + 211 + 211 + 1 = 666.

It is not a de Polignac number, because 21221102112111 - 2² = 21221102112107 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21221102112121) 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, 41277901 + ... + 41788841.

It is an arithmetic number, because the mean of its divisors is an integer number (719986255170).

Almost surely, 2^{21221102112111} is an apocalyptic number.

21221102112111 is a deficient number, since it is larger than the sum of its proper divisors (13338238136049).

21221102112111 is a wasteful number, since it uses less digits than its factorization.

21221102112111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 523685 (or 523668 counting only the distinct ones).

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

Adding to 21221102112111 its reverse (11121120112212), we get a palindrome (32342222224323).

The spelling of 21221102112111 in words is "twenty-one trillion, two hundred twenty-one billion, one hundred two million, one hundred twelve thousand, one hundred eleven".