11680221 has 16 divisors (see below), whose sum is σ = 17865344. Its totient is φ = 6649344.

The previous prime is 11680213. The next prime is 11680237. The reversal of 11680221 is 12208611.

It is not a de Polignac number, because 11680221 - 2³ = 11680213 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11680261) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5685 + ... + 7461.

It is an arithmetic number, because the mean of its divisors is an integer number (1116584).

Almost surely, 2^11680221 is an apocalyptic number.

It is an amenable number.

11680221 is a deficient number, since it is larger than the sum of its proper divisors (6185123).

11680221 is a wasteful number, since it uses less digits than its factorization.

11680221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2100.

The product of its (nonzero) digits is 192, while the sum is 21.

The square root of 11680221 is about 3417.6338305910. The cubic root of 11680221 is about 226.8908698079.

Adding to 11680221 its reverse (12208611), we get a palindrome (23888832).

The spelling of 11680221 in words is "eleven million, six hundred eighty thousand, two hundred twenty-one".