121212101010 has 768 divisors, whose sum is σ = 417654558720. Its totient is φ = 21720545280.

The previous prime is 121212100949. The next prime is 121212101011. The reversal of 121212101010 is 10101212121.

121212101010 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 not an unprimeable number, because it can be changed into a prime (121212101011) by changing a digit.

It is a polite number, since it can be written in 383 ways as a sum of consecutive naturals, for example, 2054442361 + ... + 2054442419.

It is an arithmetic number, because the mean of its divisors is an integer number (543821040).

Almost surely, 2^121212101010 is an apocalyptic number.

121212101010 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 121212101010, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (208827279360).

121212101010 is an abundant number, since it is smaller than the sum of its proper divisors (296442457710).

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

121212101010 is a wasteful number, since it uses less digits than its factorization.

121212101010 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 223 (or 180 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 12.

Adding to 121212101010 its reverse (10101212121), we get a palindrome (131313313131).

Subtracting from 121212101010 its reverse (10101212121), we obtain a square (111110888889 = 333333²).

It can be divided in two parts, 121212 and 101010, that added together give a palindrome (222222).

The spelling of 121212101010 in words is "one hundred twenty-one billion, two hundred twelve million, one hundred one thousand, ten".