12421243 has 2 divisors, whose sum is σ = 12421244. Its totient is φ = 12421242.

The previous prime is 12421229. The next prime is 12421261. The reversal of 12421243 is 34212421.

It is a weak prime.

It is an emirp because it is prime and its reverse (34212421) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 12421243 - 2²¹ = 10324091 is a prime.

It is a plaindrome in base 15.

It is a self number, because there is not a number n which added to its sum of digits gives 12421243.

It is not a weakly prime, because it can be changed into another prime (12421223) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6210621 + 6210622.

It is an arithmetic number, because the mean of its divisors is an integer number (6210622).

Almost surely, 2^12421243 is an apocalyptic number.

12421243 is a deficient number, since it is larger than the sum of its proper divisors (1).

12421243 is an equidigital number, since it uses as much as digits as its factorization.

12421243 is an evil number, because the sum of its binary digits is even.

The product of its digits is 384, while the sum is 19.

The square root of 12421243 is about 3524.3783849070. The cubic root of 12421243 is about 231.5910042811.

Adding to 12421243 its reverse (34212421), we get a palindrome (46633664).

It can be divided in two parts, 1242 and 1243, that added together give a triangular number (2485 = T₇₀).

The spelling of 12421243 in words is "twelve million, four hundred twenty-one thousand, two hundred forty-three".