13211021 has 4 divisors (see below), whose sum is σ = 13225344. Its totient is φ = 13196700.

The previous prime is 13210937. The next prime is 13211059. The reversal of 13211021 is 12011231.

13211021 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 a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 13211021 - 2²² = 9016717 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 13210993 and 13211011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13214021) 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, 5675 + ... + 7656.

It is an arithmetic number, because the mean of its divisors is an integer number (3306336).

Almost surely, 2^13211021 is an apocalyptic number.

It is an amenable number.

13211021 is a deficient number, since it is larger than the sum of its proper divisors (14323).

13211021 is an equidigital number, since it uses as much as digits as its factorization.

13211021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14322.

The product of its (nonzero) digits is 12, while the sum is 11.

The square root of 13211021 is about 3634.6968236704. The cubic root of 13211021 is about 236.3989052221.

Adding to 13211021 its reverse (12011231), we get a palindrome (25222252).

The spelling of 13211021 in words is "thirteen million, two hundred eleven thousand, twenty-one".