13220642 has 4 divisors (see below), whose sum is σ = 19830966. Its totient is φ = 6610320.

The previous prime is 13220639. The next prime is 13220659. The reversal of 13220642 is 24602231.

13220642 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: 24602231 = 2141 ⋅11491.

It can be written as a sum of positive squares in only one way, i.e., 13184161 + 36481 = 3631^2 + 191^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3305159 + ... + 3305162.

Almost surely, 2^13220642 is an apocalyptic number.

13220642 is a deficient number, since it is larger than the sum of its proper divisors (6610324).

13220642 is an equidigital number, since it uses as much as digits as its factorization.

13220642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6610323.

The product of its (nonzero) digits is 576, while the sum is 20.

The square root of 13220642 is about 3636.0200769523. The cubic root of 13220642 is about 236.4562775725.

Adding to 13220642 its reverse (24602231), we get a palindrome (37822873).

The spelling of 13220642 in words is "thirteen million, two hundred twenty thousand, six hundred forty-two".