1216051212 has 12 divisors (see below), whose sum is σ = 2837452856. Its totient is φ = 405350400.

The previous prime is 1216051201. The next prime is 1216051217. The reversal of 1216051212 is 2121506121.

It is a tau number, because it is divible by the number of its divisors (12).

It is not an unprimeable number, because it can be changed into a prime (1216051217) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 50668789 + ... + 50668812.

Almost surely, 2^1216051212 is an apocalyptic number.

1216051212 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1216051212 is an abundant number, since it is smaller than the sum of its proper divisors (1621401644).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1216051212 is a wasteful number, since it uses less digits than its factorization.

1216051212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 101337608 (or 101337606 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 21.

The square root of 1216051212 is about 34871.9258430044. The cubic root of 1216051212 is about 1067.3756432900.

Adding to 1216051212 its reverse (2121506121), we get a palindrome (3337557333).

The spelling of 1216051212 in words is "one billion, two hundred sixteen million, fifty-one thousand, two hundred twelve".