12155321 has 8 divisors (see below), whose sum is σ = 12621000. Its totient is φ = 11692800.

The previous prime is 12155291. The next prime is 12155347. The reversal of 12155321 is 12355121.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 287296 + 11868025 = 536^2 + 3445^2 .

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

It is not a de Polignac number, because 12155321 - 2⁶ = 12155257 is a prime.

It is a super-2 number, since 2×12155321² = 295503657226082, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12155293 and 12155302.

It is not an unprimeable number, because it can be changed into a prime (12155371) 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, 9521 + ... + 10721.

It is an arithmetic number, because the mean of its divisors is an integer number (1577625).

Almost surely, 2^12155321 is an apocalyptic number.

It is an amenable number.

12155321 is a deficient number, since it is larger than the sum of its proper divisors (465679).

12155321 is a wasteful number, since it uses less digits than its factorization.

12155321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1579.

The product of its digits is 300, while the sum is 20.

The square root of 12155321 is about 3486.4481926453. The cubic root of 12155321 is about 229.9263847583.

The spelling of 12155321 in words is "twelve million, one hundred fifty-five thousand, three hundred twenty-one".