13021768 has 16 divisors (see below), whose sum is σ = 24691500. Its totient is φ = 6437376.

The previous prime is 13021763. The next prime is 13021769. The reversal of 13021768 is 86712031.

It can be written as a sum of positive squares in 2 ways, for example, as 12659364 + 362404 = 3558^2 + 602^2 .

It is a plaindrome in base 15.

It is not an unprimeable number, because it can be changed into a prime (13021763) 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, 8433 + ... + 9856.

Almost surely, 2^13021768 is an apocalyptic number.

It is an amenable number.

13021768 is a deficient number, since it is larger than the sum of its proper divisors (11669732).

13021768 is a wasteful number, since it uses less digits than its factorization.

13021768 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18384 (or 18380 counting only the distinct ones).

The product of its (nonzero) digits is 2016, while the sum is 28.

The square root of 13021768 is about 3608.5686913235. The cubic root of 13021768 is about 235.2646362376.

Adding to 13021768 its reverse (86712031), we get a palindrome (99733799).

The spelling of 13021768 in words is "thirteen million, twenty-one thousand, seven hundred sixty-eight".