12091421 has 2 divisors, whose sum is σ = 12091422. Its totient is φ = 12091420.

The previous prime is 12091411. The next prime is 12091441. The reversal of 12091421 is 12419021.

It is an a-pointer prime, because the next prime (12091441) can be obtained adding 12091421 to its sum of digits (20).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11256025 + 835396 = 3355^2 + 914^2 .

It is an emirp because it is prime and its reverse (12419021) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 12091421 - 2¹⁸ = 11829277 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 12091393 and 12091402.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12091411) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6045710 + 6045711.

It is an arithmetic number, because the mean of its divisors is an integer number (6045711).

Almost surely, 2^12091421 is an apocalyptic number.

It is an amenable number.

12091421 is a deficient number, since it is larger than the sum of its proper divisors (1).

12091421 is an equidigital number, since it uses as much as digits as its factorization.

12091421 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 144, while the sum is 20.

The square root of 12091421 is about 3477.2720629827. The cubic root of 12091421 is about 229.5227722984.

The spelling of 12091421 in words is "twelve million, ninety-one thousand, four hundred twenty-one".