12217530 has 32 divisors (see below), whose sum is σ = 31578624. Its totient is φ = 3007296.

The previous prime is 12217529. The next prime is 12217537. The reversal of 12217530 is 3571221.

It is a junction number, because it is equal to n+sod(n) for n = 12217497 and 12217506.

It is not an unprimeable number, because it can be changed into a prime (12217537) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 15274 + ... + 16053.

It is an arithmetic number, because the mean of its divisors is an integer number (986832).

Almost surely, 2^12217530 is an apocalyptic number.

12217530 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

12217530 is an abundant number, since it is smaller than the sum of its proper divisors (19361094).

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

12217530 is a wasteful number, since it uses less digits than its factorization.

12217530 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31350.

The product of its (nonzero) digits is 420, while the sum is 21.

The square root of 12217530 is about 3495.3583507274. The cubic root of 12217530 is about 230.3179597351.

Adding to 12217530 its reverse (3571221), we get a palindrome (15788751).

The spelling of 12217530 in words is "twelve million, two hundred seventeen thousand, five hundred thirty".