12121415 has 4 divisors (see below), whose sum is σ = 14545704. Its totient is φ = 9697128.

The previous prime is 12121393. The next prime is 12121423. The reversal of 12121415 is 51412121.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 51412121 = 3067 ⋅16763.

It is a cyclic number.

It is not a de Polignac number, because 12121415 - 2¹⁰ = 12120391 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12121393 and 12121402.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1212137 + ... + 1212146.

It is an arithmetic number, because the mean of its divisors is an integer number (3636426).

Almost surely, 2^12121415 is an apocalyptic number.

12121415 is a deficient number, since it is larger than the sum of its proper divisors (2424289).

12121415 is an equidigital number, since it uses as much as digits as its factorization.

12121415 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2424288.

The product of its digits is 80, while the sum is 17.

The square root of 12121415 is about 3481.5822552397. The cubic root of 12121415 is about 229.7124004504.

Adding to 12121415 its reverse (51412121), we get a palindrome (63533536).

The spelling of 12121415 in words is "twelve million, one hundred twenty-one thousand, four hundred fifteen".