12521330 has 16 divisors (see below), whose sum is σ = 23316120. Its totient is φ = 4835712.

The previous prime is 12521329. The next prime is 12521339. The reversal of 12521330 is 3312521.

It can be written as a sum of positive squares in 4 ways, for example, as 10647169 + 1874161 = 3263^2 + 1369^2 .

It is a junction number, because it is equal to n+sod(n) for n = 12521299 and 12521308.

It is not an unprimeable number, because it can be changed into a prime (12521339) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21299 + ... + 21878.

Almost surely, 2^12521330 is an apocalyptic number.

12521330 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

12521330 is a deficient number, since it is larger than the sum of its proper divisors (10794790).

12521330 is a wasteful number, since it uses less digits than its factorization.

12521330 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43213.

The product of its (nonzero) digits is 180, while the sum is 17.

The square root of 12521330 is about 3538.5491377117. The cubic root of 12521330 is about 232.2113734527.

Adding to 12521330 its reverse (3312521), we get a palindrome (15833851).

The spelling of 12521330 in words is "twelve million, five hundred twenty-one thousand, three hundred thirty".