12021641 has 2 divisors, whose sum is σ = 12021642. Its totient is φ = 12021640.

The previous prime is 12021629. The next prime is 12021671. The reversal of 12021641 is 14612021.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11526025 + 495616 = 3395^2 + 704^2 .

It is an emirp because it is prime and its reverse (14612021) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 12021641 - 2⁶ = 12021577 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (12021671) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6010820 + 6010821.

It is an arithmetic number, because the mean of its divisors is an integer number (6010821).

Almost surely, 2^12021641 is an apocalyptic number.

It is an amenable number.

12021641 is a deficient number, since it is larger than the sum of its proper divisors (1).

12021641 is an equidigital number, since it uses as much as digits as its factorization.

12021641 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 96, while the sum is 17.

The square root of 12021641 is about 3467.2238174078. The cubic root of 12021641 is about 229.0803923104.

Adding to 12021641 its reverse (14612021), we get a palindrome (26633662).

The spelling of 12021641 in words is "twelve million, twenty-one thousand, six hundred forty-one".