12213645 has 8 divisors (see below), whose sum is σ = 19541856. Its totient is φ = 6513936.

The previous prime is 12213629. The next prime is 12213647. The reversal of 12213645 is 54631221.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 12213645 - 2⁴ = 12213629 is a prime.

It is a super-3 number, since 3×12213645³ (a number of 22 digits) contains 333 as substring.

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 in 7 ways as a sum of consecutive naturals, for example, 407107 + ... + 407136.

It is an arithmetic number, because the mean of its divisors is an integer number (2442732).

Almost surely, 2^12213645 is an apocalyptic number.

12213645 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

12213645 is a deficient number, since it is larger than the sum of its proper divisors (7328211).

12213645 is an equidigital number, since it uses as much as digits as its factorization.

12213645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 814251.

The product of its digits is 1440, while the sum is 24.

The square root of 12213645 is about 3494.8025695309. The cubic root of 12213645 is about 230.2935445401.

Adding to 12213645 its reverse (54631221), we get a palindrome (66844866).

The spelling of 12213645 in words is "twelve million, two hundred thirteen thousand, six hundred forty-five".