1211156216 has 16 divisors (see below), whose sum is σ = 2390440200. Its totient is φ = 573705504.

The previous prime is 1211156209. The next prime is 1211156231. The reversal of 1211156216 is 6126511121.

It is a congruent number.

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 in 3 ways as a sum of consecutive naturals, for example, 3983915 + ... + 3984218.

Almost surely, 2^1211156216 is an apocalyptic number.

It is an amenable number.

1211156216 is a deficient number, since it is larger than the sum of its proper divisors (1179283984).

1211156216 is a wasteful number, since it uses less digits than its factorization.

1211156216 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7968158 (or 7968154 counting only the distinct ones).

The product of its digits is 720, while the sum is 26.

The square root of 1211156216 is about 34801.6697300575. The cubic root of 1211156216 is about 1065.9415409347.

Adding to 1211156216 its reverse (6126511121), we get a palindrome (7337667337).

The spelling of 1211156216 in words is "one billion, two hundred eleven million, one hundred fifty-six thousand, two hundred sixteen".