12213655 has 8 divisors (see below), whose sum is σ = 14968512. Its totient is φ = 9562848.

The previous prime is 12213647. The next prime is 12213661. The reversal of 12213655 is 55631221.

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

It is a cyclic number.

It is not a de Polignac number, because 12213655 - 2³ = 12213647 is a prime.

It is a Duffinian number.

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, 25752 + ... + 26221.

It is an arithmetic number, because the mean of its divisors is an integer number (1871064).

Almost surely, 2^12213655 is an apocalyptic number.

12213655 is a deficient number, since it is larger than the sum of its proper divisors (2754857).

12213655 is an equidigital number, since it uses as much as digits as its factorization.

12213655 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52025.

The product of its digits is 1800, while the sum is 25.

The square root of 12213655 is about 3494.8040002266. The cubic root of 12213655 is about 230.2936073915.

Adding to 12213655 its reverse (55631221), we get a palindrome (67844876).

The spelling of 12213655 in words is "twelve million, two hundred thirteen thousand, six hundred fifty-five".