12021371 has 4 divisors (see below), whose sum is σ = 12030072. Its totient is φ = 12012672.

The previous prime is 12021367. The next prime is 12021403. The reversal of 12021371 is 17312021.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 17312021 = 19 ⋅911159.

It is a cyclic number.

It is not a de Polignac number, because 12021371 - 2² = 12021367 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12021311) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1766 + ... + 5211.

It is an arithmetic number, because the mean of its divisors is an integer number (3007518).

Almost surely, 2^12021371 is an apocalyptic number.

12021371 is a deficient number, since it is larger than the sum of its proper divisors (8701).

12021371 is an equidigital number, since it uses as much as digits as its factorization.

12021371 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8700.

The product of its (nonzero) digits is 84, while the sum is 17.

The square root of 12021371 is about 3467.1848811392. The cubic root of 12021371 is about 229.0786772875.

Adding to 12021371 its reverse (17312021), we get a palindrome (29333392).

The spelling of 12021371 in words is "twelve million, twenty-one thousand, three hundred seventy-one".