1212121212 has 48 divisors (see below), whose sum is σ = 2908276224. Its totient is φ = 392688000.

The previous prime is 1212121181. The next prime is 1212121217. The reversal of 1212121212 is 2121212121.

1212121212 is an esthetic number in base 10, because in such base its adjacent digits differ by 1.

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

It is an alternating number because its digits alternate between odd and even.

1212121212 is an undulating number in base 10.

1212121212 is a modest number, since divided by 121212 gives 1212 as remainder.

It is a junction number, because it is equal to n+sod(n) for n = 1212121191 and 1212121200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1212121217) 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, 128787 + ... + 137877.

It is an arithmetic number, because the mean of its divisors is an integer number (60589088).

Almost surely, 2^1212121212 is an apocalyptic number.

1212121212 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1212121212 is an abundant number, since it is smaller than the sum of its proper divisors (1696155012).

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

1212121212 is a wasteful number, since it uses less digits than its factorization.

1212121212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9410 (or 9408 counting only the distinct ones).

The product of its digits is 32, while the sum is 15.

The square root of 1212121212 is about 34815.5311893988. The cubic root of 1212121212 is about 1066.2245642259.

Adding to 1212121212 its reverse (2121212121), we get a palindrome (3333333333).

Subtracting 1212121212 from its reverse (2121212121), we obtain a palindrome (909090909).

It can be divided in two parts, 121212121 and 2, that multiplied together give a palindrome (242424242).

The spelling of 1212121212 in words is "one billion, two hundred twelve million, one hundred twenty-one thousand, two hundred twelve".