1216220108 has 6 divisors (see below), whose sum is σ = 2128385196. Its totient is φ = 608110052.

The previous prime is 1216220063. The next prime is 1216220119. The reversal of 1216220108 is 8010226121.

It is a super-2 number, since 2×1216220108² = 2958382702207063328, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 152027510 + ... + 152027517.

It is an arithmetic number, because the mean of its divisors is an integer number (354730866).

Almost surely, 2^1216220108 is an apocalyptic number.

It is an amenable number.

1216220108 is a deficient number, since it is larger than the sum of its proper divisors (912165088).

1216220108 is a wasteful number, since it uses less digits than its factorization.

1216220108 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 304055031 (or 304055029 counting only the distinct ones).

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

The square root of 1216220108 is about 34874.3474204178. The cubic root of 1216220108 is about 1067.4250565409.

Adding to 1216220108 its reverse (8010226121), we get a palindrome (9226446229).

The spelling of 1216220108 in words is "one billion, two hundred sixteen million, two hundred twenty thousand, one hundred eight".