21110112212 has 96 divisors (see below), whose sum is σ = 43824291840. Its totient is φ = 8711539200.

The previous prime is 21110112197. The next prime is 21110112223. The reversal of 21110112212 is 21221101112.

It is a Harshad number since it is a multiple of its sum of digits (14).

It is a congruent number.

It is an unprimeable number.

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 31 ways as a sum of consecutive naturals, for example, 19034714 + ... + 19035822.

It is an arithmetic number, because the mean of its divisors is an integer number (456503040).

Almost surely, 2^21110112212 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21110112212, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21912145920).

21110112212 is an abundant number, since it is smaller than the sum of its proper divisors (22714179628).

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

21110112212 is a wasteful number, since it uses less digits than its factorization.

21110112212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1401 (or 1399 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 21110112212 its reverse (21221101112), we get a palindrome (42331213324).

The spelling of 21110112212 in words is "twenty-one billion, one hundred ten million, one hundred twelve thousand, two hundred twelve".