Adding to 12101212 its reverse (21210121), we get a palindrome (33311333).
12101212 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.
12101212 is an esthetic number in base 10, because in such base its adjacent digits differ by 1.
It is an alternating number because its digits alternate between odd and even.
It is a congruent number.
It is an unprimeable number.
Almost surely, 212101212 is an apocalyptic number.
It is an amenable number.
12101212 is a wasteful number, since it uses less digits than its factorization.
12101212 is an evil number, because the sum of its binary digits is even.
The square root of 12101212 is about 3478.6796345740. The cubic root of 12101212 is about 229.5847074276.
The spelling of 12101212 in words is "twelve million, one hundred one thousand, two hundred twelve".