12190421 has 2 divisors, whose sum is σ = 12190422. Its totient is φ = 12190420.

The previous prime is 12190417. The next prime is 12190441. The reversal of 12190421 is 12409121.

It is an a-pointer prime, because the next prime (12190441) can be obtained adding 12190421 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., 10956100 + 1234321 = 3310^2 + 1111^2 .

It is a cyclic number.

It is not a de Polignac number, because 12190421 - 2² = 12190417 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 12190393 and 12190402.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12190441) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6095210 + 6095211.

It is an arithmetic number, because the mean of its divisors is an integer number (6095211).

Almost surely, 2^12190421 is an apocalyptic number.

It is an amenable number.

12190421 is a deficient number, since it is larger than the sum of its proper divisors (1).

12190421 is an equidigital number, since it uses as much as digits as its factorization.

12190421 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 12190421 is about 3491.4783401877. The cubic root of 12190421 is about 230.1474857459.

Adding to 12190421 its reverse (12409121), we get a palindrome (24599542).

The spelling of 12190421 in words is "twelve million, one hundred ninety thousand, four hundred twenty-one".