12215560 has 32 divisors (see below), whose sum is σ = 31412160. Its totient is φ = 4188096.

The previous prime is 12215557. The next prime is 12215573. The reversal of 12215560 is 6551221.

It is a super-2 number, since 2×12215560² = 298439812227200, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21534 + ... + 22093.

It is an arithmetic number, because the mean of its divisors is an integer number (981630).

Almost surely, 2^12215560 is an apocalyptic number.

12215560 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12215560 is an abundant number, since it is smaller than the sum of its proper divisors (19196600).

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

12215560 is a wasteful number, since it uses less digits than its factorization.

12215560 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43645 (or 43641 counting only the distinct ones).

The product of its (nonzero) digits is 600, while the sum is 22.

The square root of 12215560 is about 3495.0765370733. The cubic root of 12215560 is about 230.3055799614.

Adding to 12215560 its reverse (6551221), we get a palindrome (18766781).

The spelling of 12215560 in words is "twelve million, two hundred fifteen thousand, five hundred sixty".