1216312300 has 72 divisors (see below), whose sum is σ = 3078101600. Its totient is φ = 417009600.

The previous prime is 1216312291. The next prime is 1216312327. The reversal of 1216312300 is 32136121.

It is a super-2 number, since 2×1216312300² = 2958831222262580000, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 16570 + ... + 52030.

Almost surely, 2^1216312300 is an apocalyptic number.

1216312300 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1216312300, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1539050800).

1216312300 is an abundant number, since it is smaller than the sum of its proper divisors (1861789300).

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

1216312300 is a wasteful number, since it uses less digits than its factorization.

1216312300 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35496 (or 35475 counting only the distinct ones).

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

The square root of 1216312300 is about 34875.6691692073. The cubic root of 1216312300 is about 1067.4520268686.

Adding to 1216312300 its reverse (32136121), we get a palindrome (1248448421).

The spelling of 1216312300 in words is "one billion, two hundred sixteen million, three hundred twelve thousand, three hundred".