13321665 has 80 divisors (see below), whose sum is σ = 28250112. Its totient is φ = 5878656.

The previous prime is 13321663. The next prime is 13321667. The reversal of 13321665 is 56612331.

It is an interprime number because it is at equal distance from previous prime (13321663) and next prime (13321667).

It is not a de Polignac number, because 13321665 - 2¹ = 13321663 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (13321663) by changing a digit.

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 79 ways as a sum of consecutive naturals, for example, 104832 + ... + 104958.

Almost surely, 2^13321665 is an apocalyptic number.

13321665 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

13321665 is an abundant number, since it is smaller than the sum of its proper divisors (14928447).

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

13321665 is a wasteful number, since it uses less digits than its factorization.

13321665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 188 (or 179 counting only the distinct ones).

The product of its digits is 3240, while the sum is 27.

The square root of 13321665 is about 3649.8856146460. The cubic root of 13321665 is about 237.0570284170.

Adding to 13321665 its reverse (56612331), we get a palindrome (69933996).

The spelling of 13321665 in words is "thirteen million, three hundred twenty-one thousand, six hundred sixty-five".