12242621 has 2 divisors, whose sum is σ = 12242622. Its totient is φ = 12242620.

The previous prime is 12242617. The next prime is 12242623. The reversal of 12242621 is 12624221.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 10310521 + 1932100 = 3211^2 + 1390^2 .

It is an emirp because it is prime and its reverse (12624221) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 12242621 - 2² = 12242617 is a prime.

Together with 12242623, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 12242593 and 12242602.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12242623) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6121310 + 6121311.

It is an arithmetic number, because the mean of its divisors is an integer number (6121311).

Almost surely, 2^12242621 is an apocalyptic number.

It is an amenable number.

12242621 is a deficient number, since it is larger than the sum of its proper divisors (1).

12242621 is an equidigital number, since it uses as much as digits as its factorization.

12242621 is an evil number, because the sum of its binary digits is even.

The product of its digits is 384, while the sum is 20.

The square root of 12242621 is about 3498.9456983497. The cubic root of 12242621 is about 230.4755190347.

Adding to 12242621 its reverse (12624221), we get a palindrome (24866842).

The spelling of 12242621 in words is "twelve million, two hundred forty-two thousand, six hundred twenty-one".