12571621 has 2 divisors, whose sum is σ = 12571622. Its totient is φ = 12571620.

The previous prime is 12571583. The next prime is 12571649. The reversal of 12571621 is 12617521.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11492100 + 1079521 = 3390^2 + 1039^2 .

It is a cyclic number.

It is not a de Polignac number, because 12571621 - 2¹⁹ = 12047333 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12571651) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6285810 + 6285811.

It is an arithmetic number, because the mean of its divisors is an integer number (6285811).

Almost surely, 2^12571621 is an apocalyptic number.

It is an amenable number.

12571621 is a deficient number, since it is larger than the sum of its proper divisors (1).

12571621 is an equidigital number, since it uses as much as digits as its factorization.

12571621 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 840, while the sum is 25.

The square root of 12571621 is about 3545.6481776961. The cubic root of 12571621 is about 232.5218447891.

The spelling of 12571621 in words is "twelve million, five hundred seventy-one thousand, six hundred twenty-one".