12121215 has 8 divisors (see below), whose sum is σ = 19393968. Its totient is φ = 6464640.

The previous prime is 12121211. The next prime is 12121231. The reversal of 12121215 is 51212121.

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

It is not a de Polignac number, because 12121215 - 2² = 12121211 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (15), and also a Moran number because the ratio is a prime number: 808081 = 12121215 / (1 + 2 + 1 + 2 + 1 + 2 + 1 + 5).

It is a junction number, because it is equal to n+sod(n) for n = 12121194 and 12121203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12121211) 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, 404026 + ... + 404055.

It is an arithmetic number, because the mean of its divisors is an integer number (2424246).

Almost surely, 2^12121215 is an apocalyptic number.

12121215 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

12121215 is a deficient number, since it is larger than the sum of its proper divisors (7272753).

12121215 is an equidigital number, since it uses as much as digits as its factorization.

12121215 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 808089.

The product of its digits is 40, while the sum is 15.

The square root of 12121215 is about 3481.5535325484. The cubic root of 12121215 is about 229.7111370464.

Adding to 12121215 its reverse (51212121), we get a palindrome (63333336).

The spelling of 12121215 in words is "twelve million, one hundred twenty-one thousand, two hundred fifteen".