12021378 has 24 divisors (see below), whose sum is σ = 24592272. Its totient is φ = 3917544.

The previous prime is 12021367. The next prime is 12021403. The reversal of 12021378 is 87312021.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 12801 + ... + 13707.

It is an arithmetic number, because the mean of its divisors is an integer number (1024678).

Almost surely, 2^12021378 is an apocalyptic number.

12021378 is an abundant number, since it is smaller than the sum of its proper divisors (12570894).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

12021378 is an equidigital number, since it uses as much as digits as its factorization.

12021378 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1006 (or 959 counting only the distinct ones).

The product of its (nonzero) digits is 672, while the sum is 24.

The square root of 12021378 is about 3467.1858906035. The cubic root of 12021378 is about 229.0787217514.

Adding to 12021378 its reverse (87312021), we get a palindrome (99333399).

The spelling of 12021378 in words is "twelve million, twenty-one thousand, three hundred seventy-eight".