12213646 has 4 divisors (see below), whose sum is σ = 18320472. Its totient is φ = 6106822.

The previous prime is 12213629. The next prime is 12213647. The reversal of 12213646 is 64631221.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 64631221 = 53 ⋅1219457.

It is a super-2 number, since 2×12213646² = 298346297226632, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 12213646.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12213647) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3053410 + ... + 3053413.

It is an arithmetic number, because the mean of its divisors is an integer number (4580118).

Almost surely, 2^12213646 is an apocalyptic number.

12213646 is a deficient number, since it is larger than the sum of its proper divisors (6106826).

12213646 is an equidigital number, since it uses as much as digits as its factorization.

12213646 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6106825.

The product of its digits is 1728, while the sum is 25.

The square root of 12213646 is about 3494.8027126005. The cubic root of 12213646 is about 230.2935508252.

Adding to 12213646 its reverse (64631221), we get a palindrome (76844867).

The spelling of 12213646 in words is "twelve million, two hundred thirteen thousand, six hundred forty-six".