1216612212 has 24 divisors (see below), whose sum is σ = 2840658912. Its totient is φ = 405266400.

The previous prime is 1216612129. The next prime is 1216612217. The reversal of 1216612212 is 2122166121.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1216612217) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14739 + ... + 51482.

It is an arithmetic number, because the mean of its divisors is an integer number (118360788).

Almost surely, 2^1216612212 is an apocalyptic number.

1216612212 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1216612212 is an abundant number, since it is smaller than the sum of its proper divisors (1624046700).

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

1216612212 is a wasteful number, since it uses less digits than its factorization.

1216612212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 67759 (or 67757 counting only the distinct ones).

The product of its digits is 576, while the sum is 24.

The square root of 1216612212 is about 34879.9686353070. The cubic root of 1216612212 is about 1067.5397552595.

Adding to 1216612212 its reverse (2122166121), we get a palindrome (3338778333).

The spelling of 1216612212 in words is "one billion, two hundred sixteen million, six hundred twelve thousand, two hundred twelve".