13821011 has 4 divisors (see below), whose sum is σ = 13834152. Its totient is φ = 13807872.

The previous prime is 13821007. The next prime is 13821019. The reversal of 13821011 is 11012831.

13821011 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: 11012831 = 139 ⋅79229.

It is a cyclic number.

It is not a de Polignac number, because 13821011 - 2² = 13821007 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13821019) 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, 4841 + ... + 7146.

It is an arithmetic number, because the mean of its divisors is an integer number (3458538).

Almost surely, 2^13821011 is an apocalyptic number.

13821011 is a deficient number, since it is larger than the sum of its proper divisors (13141).

13821011 is a wasteful number, since it uses less digits than its factorization.

13821011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13140.

The product of its (nonzero) digits is 48, while the sum is 17.

The square root of 13821011 is about 3717.6620341284. The cubic root of 13821011 is about 239.9827012995.

Adding to 13821011 its reverse (11012831), we get a palindrome (24833842).

The spelling of 13821011 in words is "thirteen million, eight hundred twenty-one thousand, eleven".