12200521 has 2 divisors, whose sum is σ = 12200522. Its totient is φ = 12200520.

The previous prime is 12200483. The next prime is 12200533. The reversal of 12200521 is 12500221.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 9000000 + 3200521 = 3000^2 + 1789^2 .

It is an emirp because it is prime and its reverse (12500221) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 12200521 - 2⁹ = 12200009 is a prime.

It is not a weakly prime, because it can be changed into another prime (12200581) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6100260 + 6100261.

It is an arithmetic number, because the mean of its divisors is an integer number (6100261).

Almost surely, 2^12200521 is an apocalyptic number.

It is an amenable number.

12200521 is a deficient number, since it is larger than the sum of its proper divisors (1).

12200521 is an equidigital number, since it uses as much as digits as its factorization.

12200521 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 40, while the sum is 13.

The square root of 12200521 is about 3492.9244194514. The cubic root of 12200521 is about 230.2110287507.

Adding to 12200521 its reverse (12500221), we get a palindrome (24700742).

It can be divided in two parts, 12200 and 521, that added together give a palindrome (12721).

The spelling of 12200521 in words is "twelve million, two hundred thousand, five hundred twenty-one".