12215500 has 48 divisors (see below), whose sum is σ = 29117088. Its totient is φ = 4440000.

The previous prime is 12215477. The next prime is 12215527. The reversal of 12215500 is 551221.

12215500 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-3 number, since 3×12215500³ (a number of 22 digits) contains 333 as substring.

It is a hoax number, since the sum of its digits (16) coincides with the sum of the digits of its distinct prime factors.

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, 4390 + ... + 6610.

It is an arithmetic number, because the mean of its divisors is an integer number (606606).

Almost surely, 2^12215500 is an apocalyptic number.

12215500 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 12215500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (14558544).

12215500 is an abundant number, since it is smaller than the sum of its proper divisors (16901588).

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

12215500 is a wasteful number, since it uses less digits than its factorization.

12215500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2251 (or 2239 counting only the distinct ones).

The product of its (nonzero) digits is 100, while the sum is 16.

The square root of 12215500 is about 3495.0679535597. The cubic root of 12215500 is about 230.3052028916.

Adding to 12215500 its reverse (551221), we get a palindrome (12766721).

It can be divided in two parts, 12 and 215500, that added together give a palindrome (215512).

The spelling of 12215500 in words is "twelve million, two hundred fifteen thousand, five hundred".