12287021 has 4 divisors (see below), whose sum is σ = 12368544. Its totient is φ = 12205500.

The previous prime is 12287017. The next prime is 12287057. The reversal of 12287021 is 12078221.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 12287021 - 2² = 12287017 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12287321) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 40535 + ... + 40836.

It is an arithmetic number, because the mean of its divisors is an integer number (3092136).

Almost surely, 2^12287021 is an apocalyptic number.

It is an amenable number.

12287021 is a deficient number, since it is larger than the sum of its proper divisors (81523).

12287021 is an equidigital number, since it uses as much as digits as its factorization.

12287021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 81522.

The product of its (nonzero) digits is 448, while the sum is 23.

The square root of 12287021 is about 3505.2847245267. The cubic root of 12287021 is about 230.7538027777.

The spelling of 12287021 in words is "twelve million, two hundred eighty-seven thousand, twenty-one".