1213131212 has 12 divisors (see below), whose sum is σ = 2154666360. Its totient is φ = 597512256.

The previous prime is 1213131211. The next prime is 1213131223. The reversal of 1213131212 is 2121313121.

It is a super-3 number, since 3×1213131212³ (a number of 28 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (1213131211) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2263037 + ... + 2263572.

It is an arithmetic number, because the mean of its divisors is an integer number (179555530).

Almost surely, 2^1213131212 is an apocalyptic number.

It is an amenable number.

1213131212 is a deficient number, since it is larger than the sum of its proper divisors (941535148).

1213131212 is a wasteful number, since it uses less digits than its factorization.

1213131212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4526680 (or 4526678 counting only the distinct ones).

The product of its digits is 72, while the sum is 17.

The square root of 1213131212 is about 34830.0331897631. The cubic root of 1213131212 is about 1066.5206258827.

Adding to 1213131212 its reverse (2121313121), we get a palindrome (3334444333).

It can be divided in two parts, 121313121 and 2, that multiplied together give a palindrome (242626242).

The spelling of 1213131212 in words is "one billion, two hundred thirteen million, one hundred thirty-one thousand, two hundred twelve".