21102011112111 has 32 divisors (see below), whose sum is σ = 28749948323328. Its totient is φ = 13763924697600.

The previous prime is 21102011112103. The next prime is 21102011112157. The reversal of 21102011112111 is 11121111020112.

It is not a de Polignac number, because 21102011112111 - 2³ = 21102011112103 is a prime.

It is a super-2 number, since 2×21102011112111² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21102011112211) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 188636251 + ... + 188748083.

It is an arithmetic number, because the mean of its divisors is an integer number (898435885104).

Almost surely, 2^{21102011112111} is an apocalyptic number.

21102011112111 is a deficient number, since it is larger than the sum of its proper divisors (7647937211217).

21102011112111 is a wasteful number, since it uses less digits than its factorization.

21102011112111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 118271.

The product of its (nonzero) digits is 8, while the sum is 15.

Adding to 21102011112111 its reverse (11121111020112), we get a palindrome (32223122132223).

The spelling of 21102011112111 in words is "twenty-one trillion, one hundred two billion, eleven million, one hundred twelve thousand, one hundred eleven".