21212000112 has 80 divisors (see below), whose sum is σ = 55747209728. Its totient is φ = 6948840960.

The previous prime is 21212000107. The next prime is 21212000119. The reversal of 21212000112 is 21100021212.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21212000119) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 980937 + ... + 1002327.

Almost surely, 2^21212000112 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 21212000112, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27873604864).

21212000112 is an abundant number, since it is smaller than the sum of its proper divisors (34535209616).

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

21212000112 is a wasteful number, since it uses less digits than its factorization.

21212000112 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21758 (or 21752 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 12.

Adding to 21212000112 its reverse (21100021212), we get a palindrome (42312021324).

The spelling of 21212000112 in words is "twenty-one billion, two hundred twelve million, one hundred twelve", and thus it is an aban number.