1216213300 has 18 divisors (see below), whose sum is σ = 2639183078. Its totient is φ = 486485280.

The previous prime is 1216213289. The next prime is 1216213307. The reversal of 1216213300 is 33126121.

It can be written as a sum of positive squares in 3 ways, for example, as 17424 + 1216195876 = 132^2 + 34874^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1216213307) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 6080967 + ... + 6081166.

Almost surely, 2^1216213300 is an apocalyptic number.

1216213300 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1216213300 is an abundant number, since it is smaller than the sum of its proper divisors (1422969778).

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

1216213300 is a wasteful number, since it uses less digits than its factorization.

1216213300 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12162147 (or 12162140 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 19.

The square root of 1216213300 is about 34874.2498127200. The cubic root of 1216213300 is about 1067.4230648391.

Adding to 1216213300 its reverse (33126121), we get a palindrome (1249339421).

The spelling of 1216213300 in words is "one billion, two hundred sixteen million, two hundred thirteen thousand, three hundred".