12216015 has 80 divisors (see below), whose sum is σ = 26019840. Its totient is φ = 5365440.

The previous prime is 12215971. The next prime is 12216037. The reversal of 12216015 is 51061221.

It is not a de Polignac number, because 12216015 - 2¹⁰ = 12214991 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 87816 + ... + 87954.

It is an arithmetic number, because the mean of its divisors is an integer number (325248).

Almost surely, 2^12216015 is an apocalyptic number.

12216015 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

12216015 is an abundant number, since it is smaller than the sum of its proper divisors (13803825).

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

12216015 is a wasteful number, since it uses less digits than its factorization.

12216015 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 194 (or 185 counting only the distinct ones).

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

The square root of 12216015 is about 3495.1416280317. The cubic root of 12216015 is about 230.3084393675.

Adding to 12216015 its reverse (51061221), we get a palindrome (63277236).

The spelling of 12216015 in words is "twelve million, two hundred sixteen thousand, fifteen".