1216215300 has 72 divisors (see below), whose sum is σ = 3522434272. Its totient is φ = 324000000.

The previous prime is 1216215293. The next prime is 1216215317. The reversal of 1216215300 is 35126121.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 539175 + ... + 541425.

Almost surely, 2^1216215300 is an apocalyptic number.

1216215300 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1216215300 is an abundant number, since it is smaller than the sum of its proper divisors (2306218972).

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

1216215300 is a wasteful number, since it uses less digits than its factorization.

1216215300 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4069 (or 4062 counting only the distinct ones).

The product of its (nonzero) digits is 360, while the sum is 21.

The square root of 1216215300 is about 34874.2784871601. The cubic root of 1216215300 is about 1067.4236499462.

The spelling of 1216215300 in words is "one billion, two hundred sixteen million, two hundred fifteen thousand, three hundred".