103666021 has 2 divisors, whose sum is σ = 103666022. Its totient is φ = 103666020.

The previous prime is 103666007. The next prime is 103666027. The reversal of 103666021 is 120666301.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 52041796 + 51624225 = 7214^2 + 7185^2 .

It is a cyclic number.

It is not a de Polignac number, because 103666021 - 2¹⁵ = 103633253 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (103666027) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 51833010 + 51833011.

It is an arithmetic number, because the mean of its divisors is an integer number (51833011).

Almost surely, 2^103666021 is an apocalyptic number.

It is an amenable number.

103666021 is a deficient number, since it is larger than the sum of its proper divisors (1).

103666021 is an equidigital number, since it uses as much as digits as its factorization.

103666021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1296, while the sum is 25.

The square root of 103666021 is about 10181.6511922183. The cubic root of 103666021 is about 469.7630025905.

The spelling of 103666021 in words is "one hundred three million, six hundred sixty-six thousand, twenty-one".