13011221 has 8 divisors (see below), whose sum is σ = 13305600. Its totient is φ = 12720240.

The previous prime is 13011209. The next prime is 13011223. The reversal of 13011221 is 12211031.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 13011221 - 2¹⁰ = 13010197 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13011223) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7856 + ... + 9366.

It is an arithmetic number, because the mean of its divisors is an integer number (1663200).

Almost surely, 2^13011221 is an apocalyptic number.

It is an amenable number.

13011221 is a deficient number, since it is larger than the sum of its proper divisors (294379).

13011221 is a wasteful number, since it uses less digits than its factorization.

13011221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1699.

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

The square root of 13011221 is about 3607.1070125517. The cubic root of 13011221 is about 235.2011014360.

Adding to 13011221 its reverse (12211031), we get a palindrome (25222252).

The spelling of 13011221 in words is "thirteen million, eleven thousand, two hundred twenty-one".