12215553 has 24 divisors (see below), whose sum is σ = 19775808. Its totient is φ = 6674976.

The previous prime is 12215543. The next prime is 12215557. The reversal of 12215553 is 35551221.

It is a happy number.

It is not a de Polignac number, because 12215553 - 2⁸ = 12215297 is a prime.

It is not an unprimeable number, because it can be changed into a prime (12215557) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1575 + ... + 5187.

It is an arithmetic number, because the mean of its divisors is an integer number (823992).

Almost surely, 2^12215553 is an apocalyptic number.

It is an amenable number.

12215553 is a deficient number, since it is larger than the sum of its proper divisors (7560255).

12215553 is a wasteful number, since it uses less digits than its factorization.

12215553 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3653 (or 3646 counting only the distinct ones).

The product of its digits is 1500, while the sum is 24.

The square root of 12215553 is about 3495.0755356644. The cubic root of 12215553 is about 230.3055359700.

Adding to 12215553 its reverse (35551221), we get a palindrome (47766774).

The spelling of 12215553 in words is "twelve million, two hundred fifteen thousand, five hundred fifty-three".