1216321214 has 16 divisors (see below), whose sum is σ = 1921286400. Its totient is φ = 575918424.

The previous prime is 1216321201. The next prime is 1216321241. The reversal of 1216321214 is 4121236121.

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

It is a self number, because there is not a number n which added to its sum of digits gives 1216321214.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 120827 + ... + 130505.

It is an arithmetic number, because the mean of its divisors is an integer number (120080400).

Almost surely, 2^1216321214 is an apocalyptic number.

1216321214 is a deficient number, since it is larger than the sum of its proper divisors (704965186).

1216321214 is a wasteful number, since it uses less digits than its factorization.

1216321214 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13007.

The product of its digits is 576, while the sum is 23.

The square root of 1216321214 is about 34875.7969658042. The cubic root of 1216321214 is about 1067.4546345443.

Adding to 1216321214 its reverse (4121236121), we get a palindrome (5337557335).

The spelling of 1216321214 in words is "one billion, two hundred sixteen million, three hundred twenty-one thousand, two hundred fourteen".