103665021 has 8 divisors (see below), whose sum is σ = 138536640. Its totient is φ = 68951712.

The previous prime is 103665019. The next prime is 103665061. The reversal of 103665021 is 120566301.

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

It is not a de Polignac number, because 103665021 - 2¹ = 103665019 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 103664982 and 103665000.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (103665011) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 38040 + ... + 40673.

It is an arithmetic number, because the mean of its divisors is an integer number (17317080).

Almost surely, 2^103665021 is an apocalyptic number.

It is an amenable number.

103665021 is a deficient number, since it is larger than the sum of its proper divisors (34871619).

103665021 is an equidigital number, since it uses as much as digits as its factorization.

103665021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 79155.

The product of its (nonzero) digits is 1080, while the sum is 24.

The square root of 103665021 is about 10181.6020841516. The cubic root of 103665021 is about 469.7614920843.

The spelling of 103665021 in words is "one hundred three million, six hundred sixty-five thousand, twenty-one".