12280621 has 2 divisors, whose sum is σ = 12280622. Its totient is φ = 12280620.

The previous prime is 12280591. The next prime is 12280661. The reversal of 12280621 is 12608221.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6687396 + 5593225 = 2586^2 + 2365^2 .

It is a cyclic number.

It is not a de Polignac number, because 12280621 - 2⁷ = 12280493 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 12280592 and 12280601.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12280661) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6140310 + 6140311.

It is an arithmetic number, because the mean of its divisors is an integer number (6140311).

Almost surely, 2^12280621 is an apocalyptic number.

It is an amenable number.

12280621 is a deficient number, since it is larger than the sum of its proper divisors (1).

12280621 is an equidigital number, since it uses as much as digits as its factorization.

12280621 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 384, while the sum is 22.

The square root of 12280621 is about 3504.3716983220. The cubic root of 12280621 is about 230.7137312034.

Adding to 12280621 its reverse (12608221), we get a palindrome (24888842).

The spelling of 12280621 in words is "twelve million, two hundred eighty thousand, six hundred twenty-one".