103668821 has 4 divisors (see below), whose sum is σ = 103922700. Its totient is φ = 103414944.

The previous prime is 103668811. The next prime is 103668893. The reversal of 103668821 is 128866301.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 63840100 + 39828721 = 7990^2 + 6311^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-103668821 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (103668811) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 126326 + ... + 127143.

It is an arithmetic number, because the mean of its divisors is an integer number (25980675).

Almost surely, 2^103668821 is an apocalyptic number.

It is an amenable number.

103668821 is a deficient number, since it is larger than the sum of its proper divisors (253879).

103668821 is an equidigital number, since it uses as much as digits as its factorization.

103668821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 253878.

The product of its (nonzero) digits is 13824, while the sum is 35.

The square root of 103668821 is about 10181.7886935450. The cubic root of 103668821 is about 469.7672319563.

The spelling of 103668821 in words is "one hundred three million, six hundred sixty-eight thousand, eight hundred twenty-one".