1216041212 has 48 divisors (see below), whose sum is σ = 2314902240. Its totient is φ = 556800000.

The previous prime is 1216041209. The next prime is 1216041221. The reversal of 1216041212 is 2121406121.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 403712 + ... + 406712.

It is an arithmetic number, because the mean of its divisors is an integer number (48227130).

Almost surely, 2^1216041212 is an apocalyptic number.

It is an amenable number.

1216041212 is a deficient number, since it is larger than the sum of its proper divisors (1098861028).

1216041212 is a wasteful number, since it uses less digits than its factorization.

1216041212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3182 (or 3180 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 20.

The square root of 1216041212 is about 34871.7824608952. The cubic root of 1216041212 is about 1067.3727174851.

Adding to 1216041212 its reverse (2121406121), we get a palindrome (3337447333).

The spelling of 1216041212 in words is "one billion, two hundred sixteen million, forty-one thousand, two hundred twelve".