1216022216 has 8 divisors (see below), whose sum is σ = 2280041670. Its totient is φ = 608011104.

The previous prime is 1216022209. The next prime is 1216022233. The reversal of 1216022216 is 6122206121.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 642419716 + 573602500 = 25346^2 + 23950^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a junction number, because it is equal to n+sod(n) for n = 1216022191 and 1216022200.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 76001381 + ... + 76001396.

Almost surely, 2^1216022216 is an apocalyptic number.

It is an amenable number.

1216022216 is a deficient number, since it is larger than the sum of its proper divisors (1064019454).

1216022216 is a wasteful number, since it uses less digits than its factorization.

1216022216 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 152002783 (or 152002779 counting only the distinct ones).

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

The square root of 1216022216 is about 34871.5100906170. The cubic root of 1216022216 is about 1067.3671595820.

Adding to 1216022216 its reverse (6122206121), we get a palindrome (7338228337).

The spelling of 1216022216 in words is "one billion, two hundred sixteen million, twenty-two thousand, two hundred sixteen".