12355221 has 8 divisors (see below), whose sum is σ = 16492384. Its totient is φ = 8227440.

The previous prime is 12355199. The next prime is 12355223. The reversal of 12355221 is 12255321.

12355221 is digitally balanced in base 2 and base 3, because in such bases it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 12355221 - 2⁶ = 12355157 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12355223) 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, 1755 + ... + 5271.

It is an arithmetic number, because the mean of its divisors is an integer number (2061548).

Almost surely, 2^12355221 is an apocalyptic number.

It is an amenable number.

12355221 is a deficient number, since it is larger than the sum of its proper divisors (4137163).

12355221 is a wasteful number, since it uses less digits than its factorization.

It is an anagram of its base 9 representation: 12355221 = (25221153)₉.

12355221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4691.

The product of its digits is 600, while the sum is 21.

The square root of 12355221 is about 3514.9994310099. Note that the first 3 decimals coincide. The cubic root of 12355221 is about 231.1799538520.

The spelling of 12355221 in words is "twelve million, three hundred fifty-five thousand, two hundred twenty-one".