11321660 has 96 divisors (see below), whose sum is σ = 29611008. Its totient is φ = 3548160.

The previous prime is 11321659. The next prime is 11321671. The reversal of 11321660 is 6612311.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a nialpdrome in base 15.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 159425 + ... + 159495.

It is an arithmetic number, because the mean of its divisors is an integer number (308448).

Almost surely, 2^11321660 is an apocalyptic number.

11321660 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 11321660, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (14805504).

11321660 is an abundant number, since it is smaller than the sum of its proper divisors (18289348).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

11321660 is a wasteful number, since it uses less digits than its factorization.

11321660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 171 (or 169 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 20.

The square root of 11321660 is about 3364.7674511027. The cubic root of 11321660 is about 224.5449899335.

Adding to 11321660 its reverse (6612311), we get a palindrome (17933971).

The spelling of 11321660 in words is "eleven million, three hundred twenty-one thousand, six hundred sixty".