12123215 has 12 divisors (see below), whose sum is σ = 15754104. Its totient is φ = 8951904.

The previous prime is 12123211. The next prime is 12123217. The reversal of 12123215 is 51232121.

It is a happy number.

It is not a de Polignac number, because 12123215 - 2² = 12123211 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12123193 and 12123202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12123211) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 6329 + ... + 8018.

It is an arithmetic number, because the mean of its divisors is an integer number (1312842).

Almost surely, 2^12123215 is an apocalyptic number.

12123215 is a deficient number, since it is larger than the sum of its proper divisors (3630889).

12123215 is a wasteful number, since it uses less digits than its factorization.

12123215 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14378 (or 14365 counting only the distinct ones).

The product of its digits is 120, while the sum is 17.

The square root of 12123215 is about 3481.8407487994. The cubic root of 12123215 is about 229.7237704611.

Adding to 12123215 its reverse (51232121), we get a palindrome (63355336).

The spelling of 12123215 in words is "twelve million, one hundred twenty-three thousand, two hundred fifteen".