12215231 has 16 divisors (see below), whose sum is σ = 15427584. Its totient is φ = 9423744.

The previous prime is 12215221. The next prime is 12215237. The reversal of 12215231 is 13251221.

It is a happy number.

It is not a de Polignac number, because 12215231 - 2⁶ = 12215167 is a prime.

It is a super-2 number, since 2×12215231² = 298423736766722, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (17).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12215237) 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, 506 + ... + 4968.

It is an arithmetic number, because the mean of its divisors is an integer number (964224).

Almost surely, 2^12215231 is an apocalyptic number.

12215231 is a deficient number, since it is larger than the sum of its proper divisors (3212353).

12215231 is a wasteful number, since it uses less digits than its factorization.

12215231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4510.

The product of its digits is 120, while the sum is 17.

The square root of 12215231 is about 3495.0294705481. The cubic root of 12215231 is about 230.3035123467.

Adding to 12215231 its reverse (13251221), we get a palindrome (25466452).

The spelling of 12215231 in words is "twelve million, two hundred fifteen thousand, two hundred thirty-one".