12271621 has 2 divisors, whose sum is σ = 12271622. Its totient is φ = 12271620.

The previous prime is 12271613. The next prime is 12271631. The reversal of 12271621 is 12617221.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11655396 + 616225 = 3414^2 + 785^2 .

It is an emirp because it is prime and its reverse (12617221) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 12271621 - 2³ = 12271613 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 12271592 and 12271601.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12271631) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6135810 + 6135811.

It is an arithmetic number, because the mean of its divisors is an integer number (6135811).

Almost surely, 2^12271621 is an apocalyptic number.

It is an amenable number.

12271621 is a deficient number, since it is larger than the sum of its proper divisors (1).

12271621 is an equidigital number, since it uses as much as digits as its factorization.

12271621 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 336, while the sum is 22.

The square root of 12271621 is about 3503.0873526077. The cubic root of 12271621 is about 230.6573569904.

Adding to 12271621 its reverse (12617221), we get a palindrome (24888842).

The spelling of 12271621 in words is "twelve million, two hundred seventy-one thousand, six hundred twenty-one".