12421212 has 48 divisors (see below), whose sum is σ = 30791040. Its totient is φ = 3886272.

The previous prime is 12421187. The next prime is 12421217. The reversal of 12421212 is 21212421.

12421212 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

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

It is a plaindrome in base 15.

It is a junction number, because it is equal to n+sod(n) for n = 12421191 and 12421200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12421217) 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, 35623 + ... + 35969.

It is an arithmetic number, because the mean of its divisors is an integer number (641480).

Almost surely, 2^12421212 is an apocalyptic number.

12421212 is a gapful number since it is divisible by the number (12) 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 12421212, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (15395520).

12421212 is an abundant number, since it is smaller than the sum of its proper divisors (18369828).

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

12421212 is a wasteful number, since it uses less digits than its factorization.

12421212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 530 (or 528 counting only the distinct ones).

The product of its digits is 64, while the sum is 15.

The square root of 12421212 is about 3524.3739869656. The cubic root of 12421212 is about 231.5908116185.

Adding to 12421212 its reverse (21212421), we get a palindrome (33633633).

The spelling of 12421212 in words is "twelve million, four hundred twenty-one thousand, two hundred twelve".