12320521 has 4 divisors (see below), whose sum is σ = 12355200. Its totient is φ = 12285844.

The previous prime is 12320507. The next prime is 12320549. The reversal of 12320521 is 12502321.

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 12320521 - 2¹¹ = 12318473 is a prime.

It is a super-2 number, since 2×12320521² = 303590475422882, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12320495 and 12320504.

It is not an unprimeable number, because it can be changed into a prime (12320921) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16801 + ... + 17518.

It is an arithmetic number, because the mean of its divisors is an integer number (3088800).

Almost surely, 2^12320521 is an apocalyptic number.

It is an amenable number.

12320521 is a deficient number, since it is larger than the sum of its proper divisors (34679).

12320521 is an equidigital number, since it uses as much as digits as its factorization.

12320521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34678.

The product of its (nonzero) digits is 120, while the sum is 16.

The square root of 12320521 is about 3510.0599709976. The cubic root of 12320521 is about 230.9633256996.

Adding to 12320521 its reverse (12502321), we get a palindrome (24822842).

The spelling of 12320521 in words is "twelve million, three hundred twenty thousand, five hundred twenty-one".