1216020218 has 32 divisors (see below), whose sum is σ = 2121154560. Its totient is φ = 512083440.

The previous prime is 1216020209. The next prime is 1216020259. The reversal of 1216020218 is 8120206121.

It is a junction number, because it is equal to n+sod(n) for n = 1216020193 and 1216020202.

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, 219203 + ... + 224681.

It is an arithmetic number, because the mean of its divisors is an integer number (66286080).

Almost surely, 2^1216020218 is an apocalyptic number.

1216020218 is a deficient number, since it is larger than the sum of its proper divisors (905134342).

1216020218 is a wasteful number, since it uses less digits than its factorization.

1216020218 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5762.

The product of its (nonzero) digits is 384, while the sum is 23.

The square root of 1216020218 is about 34871.4814425771. The cubic root of 1216020218 is about 1067.3665749982.

Adding to 1216020218 its reverse (8120206121), we get a palindrome (9336226339).

The spelling of 1216020218 in words is "one billion, two hundred sixteen million, twenty thousand, two hundred eighteen".