12220513 has 4 divisors (see below), whose sum is σ = 12641940. Its totient is φ = 11799088.

The previous prime is 12220489. The next prime is 12220519. The reversal of 12220513 is 31502221.

12220513 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 31502221 = 431 ⋅73091.

It can be written as a sum of positive squares in 2 ways, for example, as 10349089 + 1871424 = 3217^2 + 1368^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12220513 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12220519) 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, 210670 + ... + 210727.

It is an arithmetic number, because the mean of its divisors is an integer number (3160485).

Almost surely, 2^12220513 is an apocalyptic number.

It is an amenable number.

12220513 is a deficient number, since it is larger than the sum of its proper divisors (421427).

12220513 is an equidigital number, since it uses as much as digits as its factorization.

12220513 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 421426.

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

The square root of 12220513 is about 3495.7850334367. The cubic root of 12220513 is about 230.3367028189.

Adding to 12220513 its reverse (31502221), we get a palindrome (43722734).

The spelling of 12220513 in words is "twelve million, two hundred twenty thousand, five hundred thirteen".