12521213 has 4 divisors (see below), whose sum is σ = 12812448. Its totient is φ = 12229980.

The previous prime is 12521203. The next prime is 12521219. The reversal of 12521213 is 31212521.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 12521213 - 2⁶ = 12521149 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12521191 and 12521200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12521219) 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 in 3 ways as a sum of consecutive naturals, for example, 145553 + ... + 145638.

It is an arithmetic number, because the mean of its divisors is an integer number (3203112).

Almost surely, 2^12521213 is an apocalyptic number.

It is an amenable number.

12521213 is a deficient number, since it is larger than the sum of its proper divisors (291235).

12521213 is an equidigital number, since it uses as much as digits as its factorization.

12521213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 291234.

The product of its digits is 120, while the sum is 17.

The square root of 12521213 is about 3538.5326054736. The cubic root of 12521213 is about 232.2106501851.

Adding to 12521213 its reverse (31212521), we get a palindrome (43733734).

The spelling of 12521213 in words is "twelve million, five hundred twenty-one thousand, two hundred thirteen".