21112102122012 has 36 divisors (see below), whose sum is σ = 58218221004216. Its totient is φ = 6397606703520.

The previous prime is 21112102122011. The next prime is 21112102122017. The reversal of 21112102122012 is 21022120121112.

21112102122012 is a `hidden beast` number, since 211 + 1 + 210 + 21 + 220 + 1 + 2 = 666.

It is a tau number, because it is divible by the number of its divisors (36).

It is a super-3 number, since 3×21112102122012³ (a number of 41 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21112102122011) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 26656694203 + ... + 26656694994.

Almost surely, 2^{21112102122012} is an apocalyptic number.

21112102122012 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

21112102122012 is an abundant number, since it is smaller than the sum of its proper divisors (37106118882204).

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

21112102122012 is a wasteful number, since it uses less digits than its factorization.

21112102122012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53313389218 (or 53313389213 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 18.

Adding to 21112102122012 its reverse (21022120121112), we get a palindrome (42134222243124).

Subtracting from 21112102122012 its reverse (21022120121112), we obtain a square (89982000900 = 299970²).

The spelling of 21112102122012 in words is "twenty-one trillion, one hundred twelve billion, one hundred two million, one hundred twenty-two thousand, twelve".