9216121500 has 72 divisors (see below), whose sum is σ = 29073805488. Its totient is φ = 2457631200.

The previous prime is 9216121487. The next prime is 9216121507. The reversal of 9216121500 is 51216129.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9216121507) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1019514 + ... + 1028513.

It is an arithmetic number, because the mean of its divisors is an integer number (403802854).

Almost surely, 2^9216121500 is an apocalyptic number.

9216121500 is a gapful number since it is divisible by the number (90) formed by its first and last digit.

It is an amenable number.

9216121500 is an abundant number, since it is smaller than the sum of its proper divisors (19857683988).

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

9216121500 is a wasteful number, since it uses less digits than its factorization.

9216121500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2048052 (or 2048037 counting only the distinct ones).

The product of its (nonzero) digits is 1080, while the sum is 27.

The square root of 9216121500 is about 96000.6328104143. The cubic root of 9216121500 is about 2096.6023288706.

Adding to 9216121500 its reverse (51216129), we get a palindrome (9267337629).

The spelling of 9216121500 in words is "nine billion, two hundred sixteen million, one hundred twenty-one thousand, five hundred".