11421665 has 8 divisors (see below), whose sum is σ = 13725288. Its totient is φ = 9124480.

The previous prime is 11421661. The next prime is 11421673. The reversal of 11421665 is 56612411.

It can be written as a sum of positive squares in 4 ways, for example, as 246016 + 11175649 = 496^2 + 3343^2 .

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

It is not a de Polignac number, because 11421665 - 2² = 11421661 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11421661) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4229 + ... + 6381.

It is an arithmetic number, because the mean of its divisors is an integer number (1715661).

Almost surely, 2^11421665 is an apocalyptic number.

It is an amenable number.

11421665 is a deficient number, since it is larger than the sum of its proper divisors (2303623).

11421665 is a wasteful number, since it uses less digits than its factorization.

11421665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3219.

The product of its digits is 1440, while the sum is 26.

The square root of 11421665 is about 3379.5953899838. The cubic root of 11421665 is about 225.2041932342.

The spelling of 11421665 in words is "eleven million, four hundred twenty-one thousand, six hundred sixty-five".