21112121113212 has 24 divisors (see below), whose sum is σ = 49261692261712. Its totient is φ = 7037362800000.

The previous prime is 21112121113183. The next prime is 21112121113217. The reversal of 21112121113212 is 21231112121112.

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21112121113217) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11750712 + ... + 13427712.

Almost surely, 2^{21112121113212} is an apocalyptic number.

It is an amenable number.

21112121113212 is an abundant number, since it is smaller than the sum of its proper divisors (28149571148500).

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

21112121113212 is a wasteful number, since it uses less digits than its factorization.

21112121113212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2726109 (or 2726107 counting only the distinct ones).

The product of its digits is 96, while the sum is 21.

Adding to 21112121113212 its reverse (21231112121112), we get a palindrome (42343233234324).

The spelling of 21112121113212 in words is "twenty-one trillion, one hundred twelve billion, one hundred twenty-one million, one hundred thirteen thousand, two hundred twelve".