13311021 has 4 divisors (see below), whose sum is σ = 17748032. Its totient is φ = 8874012.

The previous prime is 13311007. The next prime is 13311031. The reversal of 13311021 is 12011331.

13311021 is digitally balanced in base 2 and base 3, because in such bases 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 a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 13311021 - 2⁵ = 13310989 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 13310988 and 13311006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13311031) 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, 2218501 + ... + 2218506.

It is an arithmetic number, because the mean of its divisors is an integer number (4437008).

Almost surely, 2^13311021 is an apocalyptic number.

It is an amenable number.

13311021 is a deficient number, since it is larger than the sum of its proper divisors (4437011).

13311021 is an equidigital number, since it uses as much as digits as its factorization.

13311021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4437010.

The product of its (nonzero) digits is 18, while the sum is 12.

The square root of 13311021 is about 3648.4271953816. The cubic root of 13311021 is about 236.9938754671.

Adding to 13311021 its reverse (12011331), we get a palindrome (25322352).

The spelling of 13311021 in words is "thirteen million, three hundred eleven thousand, twenty-one".