12099421 has 2 divisors, whose sum is σ = 12099422. Its totient is φ = 12099420.

The previous prime is 12099419. The next prime is 12099431. The reversal of 12099421 is 12499021.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 9523396 + 2576025 = 3086^2 + 1605^2 .

It is an emirp because it is prime and its reverse (12499021) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 12099421 - 2¹ = 12099419 is a prime.

Together with 12099419, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 12099421.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12099401) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6049710 + 6049711.

It is an arithmetic number, because the mean of its divisors is an integer number (6049711).

Almost surely, 2^12099421 is an apocalyptic number.

It is an amenable number.

12099421 is a deficient number, since it is larger than the sum of its proper divisors (1).

12099421 is an equidigital number, since it uses as much as digits as its factorization.

12099421 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1296, while the sum is 28.

The square root of 12099421 is about 3478.4221997912. The cubic root of 12099421 is about 229.5733805595.

The spelling of 12099421 in words is "twelve million, ninety-nine thousand, four hundred twenty-one".