21012212102112 has 480 divisors, whose sum is σ = 77681600688384. Its totient is φ = 5457711156480.

The previous prime is 21012212102107. The next prime is 21012212102113. The reversal of 21012212102112 is 21120121221012.

21012212102112 is a `hidden beast` number, since 21 + 0 + 1 + 221 + 210 + 211 + 2 = 666.

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 (21012212102113) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 23714623 + ... + 24584705.

Almost surely, 2^{21012212102112} is an apocalyptic number.

21012212102112 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21012212102112, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (38840800344192).

21012212102112 is an abundant number, since it is smaller than the sum of its proper divisors (56669388586272).

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

21012212102112 is an equidigital number, since it uses as much as digits as its factorization.

21012212102112 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 870145 (or 870106 counting only the distinct ones).

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

Adding to 21012212102112 its reverse (21120121221012), we get a palindrome (42132333323124).

The spelling of 21012212102112 in words is "twenty-one trillion, twelve billion, two hundred twelve million, one hundred two thousand, one hundred twelve".