21112102122111 has 96 divisors (see below), whose sum is σ = 40959064194048. Its totient is φ = 10120129528320.

The previous prime is 21112102122103. The next prime is 21112102122127. The reversal of 21112102122111 is 11122120121112.

It is a happy number.

21112102122111 is a `hidden beast` number, since 21 + 11 + 210 + 212 + 211 + 1 = 666.

It is not a de Polignac number, because 21112102122111 - 2³ = 21112102122103 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21112102122151) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 25328590 + ... + 26148836.

It is an arithmetic number, because the mean of its divisors is an integer number (426656918688).

Almost surely, 2^{21112102122111} is an apocalyptic number.

21112102122111 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

21112102122111 is a deficient number, since it is larger than the sum of its proper divisors (19846962071937).

21112102122111 is a wasteful number, since it uses less digits than its factorization.

21112102122111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 823141 (or 823138 counting only the distinct ones).

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

Adding to 21112102122111 its reverse (11122120121112), we get a palindrome (32234222243223).

The spelling of 21112102122111 in words is "twenty-one trillion, one hundred twelve billion, one hundred two million, one hundred twenty-two thousand, one hundred eleven".