12213541 has 2 divisors, whose sum is σ = 12213542. Its totient is φ = 12213540.

The previous prime is 12213527. The next prime is 12213571. The reversal of 12213541 is 14531221.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 10536516 + 1677025 = 3246^2 + 1295^2 .

It is an emirp because it is prime and its reverse (14531221) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12213541 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12213511) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6106770 + 6106771.

It is an arithmetic number, because the mean of its divisors is an integer number (6106771).

Almost surely, 2^12213541 is an apocalyptic number.

It is an amenable number.

12213541 is a deficient number, since it is larger than the sum of its proper divisors (1).

12213541 is an equidigital number, since it uses as much as digits as its factorization.

12213541 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 240, while the sum is 19.

The square root of 12213541 is about 3494.7876902610. The cubic root of 12213541 is about 230.2928908833.

Adding to 12213541 its reverse (14531221), we get a palindrome (26744762).

The spelling of 12213541 in words is "twelve million, two hundred thirteen thousand, five hundred forty-one".