12216510 has 48 divisors (see below), whose sum is σ = 32011200. Its totient is φ = 3232320.

The previous prime is 12216499. The next prime is 12216539. The reversal of 12216510 is 1561221.

12216510 is a `hidden beast` number, since 12 + 2 + 1 + 651 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

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, 12955 + ... + 13865.

It is an arithmetic number, because the mean of its divisors is an integer number (666900).

Almost surely, 2^12216510 is an apocalyptic number.

12216510 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 12216510, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (16005600).

12216510 is an abundant number, since it is smaller than the sum of its proper divisors (19794690).

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

12216510 is a wasteful number, since it uses less digits than its factorization.

12216510 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1073 (or 1070 counting only the distinct ones).

The product of its (nonzero) digits is 120, while the sum is 18.

The square root of 12216510 is about 3495.2124398955. The cubic root of 12216510 is about 230.3115500692.

Adding to 12216510 its reverse (1561221), we get a palindrome (13777731).

The spelling of 12216510 in words is "twelve million, two hundred sixteen thousand, five hundred ten".