12021915 has 8 divisors (see below), whose sum is σ = 19235088. Its totient is φ = 6411680.

The previous prime is 12021913. The next prime is 12021923. The reversal of 12021915 is 51912021.

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

It is not a de Polignac number, because 12021915 - 2¹ = 12021913 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 12021891 and 12021900.

It is not an unprimeable number, because it can be changed into a prime (12021913) 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, 400716 + ... + 400745.

It is an arithmetic number, because the mean of its divisors is an integer number (2404386).

Almost surely, 2^12021915 is an apocalyptic number.

12021915 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

12021915 is a deficient number, since it is larger than the sum of its proper divisors (7213173).

12021915 is an equidigital number, since it uses as much as digits as its factorization.

12021915 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 801469.

The product of its (nonzero) digits is 180, while the sum is 21.

The square root of 12021915 is about 3467.2633300631. The cubic root of 12021915 is about 229.0821327148.

Adding to 12021915 its reverse (51912021), we get a palindrome (63933936).

The spelling of 12021915 in words is "twelve million, twenty-one thousand, nine hundred fifteen".