1213321212 has 36 divisors (see below), whose sum is σ = 3247420176. Its totient is φ = 380649600.

The previous prime is 1213321163. The next prime is 1213321237. The reversal of 1213321212 is 2121233121.

1213321212 is a `hidden beast` number, since 121 + 332 + 1 + 212 = 666.

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (18).

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

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 990664 + ... + 991887.

It is an arithmetic number, because the mean of its divisors is an integer number (90206116).

Almost surely, 2^1213321212 is an apocalyptic number.

1213321212 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1213321212 is an abundant number, since it is smaller than the sum of its proper divisors (2034098964).

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

1213321212 is a wasteful number, since it uses less digits than its factorization.

1213321212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1982578 (or 1982573 counting only the distinct ones).

The product of its digits is 144, while the sum is 18.

The square root of 1213321212 is about 34832.7606141115. The cubic root of 1213321212 is about 1066.5763022841.

Adding to 1213321212 its reverse (2121233121), we get a palindrome (3334554333).

The spelling of 1213321212 in words is "one billion, two hundred thirteen million, three hundred twenty-one thousand, two hundred twelve".