1216203112 has 16 divisors (see below), whose sum is σ = 2280938400. Its totient is φ = 607952880.

The previous prime is 1216203101. The next prime is 1216203133. The reversal of 1216203112 is 2113026121.

It is a self number, because there is not a number n which added to its sum of digits gives 1216203112.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21187 + ... + 53677.

It is an arithmetic number, because the mean of its divisors is an integer number (142558650).

Almost surely, 2^1216203112 is an apocalyptic number.

It is an amenable number.

1216203112 is a deficient number, since it is larger than the sum of its proper divisors (1064735288).

1216203112 is a wasteful number, since it uses less digits than its factorization.

1216203112 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37176 (or 37172 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 19.

The square root of 1216203112 is about 34874.1037447559. The cubic root of 1216203112 is about 1067.4200842938.

Adding to 1216203112 its reverse (2113026121), we get a palindrome (3329229233).

The spelling of 1216203112 in words is "one billion, two hundred sixteen million, two hundred three thousand, one hundred twelve".