1216233500 has 48 divisors (see below), whose sum is σ = 2718075360. Its totient is φ = 475171200.

The previous prime is 1216233497. The next prime is 1216233521. The reversal of 1216233500 is 53326121.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6785 + ... + 49784.

It is an arithmetic number, because the mean of its divisors is an integer number (56626570).

Almost surely, 2^1216233500 is an apocalyptic number.

1216233500 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1216233500 is an abundant number, since it is smaller than the sum of its proper divisors (1501841860).

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

1216233500 is a wasteful number, since it uses less digits than its factorization.

1216233500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56631 (or 56619 counting only the distinct ones).

The product of its (nonzero) digits is 1080, while the sum is 23.

The square root of 1216233500 is about 34874.5394234820. The cubic root of 1216233500 is about 1067.4289743910.

Adding to 1216233500 its reverse (53326121), we get a palindrome (1269559621).

The spelling of 1216233500 in words is "one billion, two hundred sixteen million, two hundred thirty-three thousand, five hundred".