1213311216 has 80 divisors (see below), whose sum is σ = 3574083744. Its totient is φ = 351363072.

The previous prime is 1213311191. The next prime is 1213311217. The reversal of 1213311216 is 6121133121.

It is a nude number because it is divisible by every one of its digits.

It is a junction number, because it is equal to n+sod(n) for n = 1213311192 and 1213311201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1213311217) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 46581 + ... + 67796.

Almost surely, 2^1213311216 is an apocalyptic number.

1213311216 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

1213311216 is an abundant number, since it is smaller than the sum of its proper divisors (2360772528).

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

1213311216 is a wasteful number, since it uses less digits than its factorization.

1213311216 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 114418 (or 114412 counting only the distinct ones).

The product of its digits is 216, while the sum is 21.

The square root of 1213311216 is about 34832.6171282033. The cubic root of 1213311216 is about 1066.5733732642.

Adding to 1213311216 its reverse (6121133121), we get a palindrome (7334444337).

The spelling of 1213311216 in words is "one billion, two hundred thirteen million, three hundred eleven thousand, two hundred sixteen".