105604021 has 2 divisors, whose sum is σ = 105604022. Its totient is φ = 105604020.

The previous prime is 105604019. The next prime is 105604067. The reversal of 105604021 is 120406501.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 54552996 + 51051025 = 7386^2 + 7145^2 .

It is an emirp because it is prime and its reverse (120406501) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 105604021 - 2¹ = 105604019 is a prime.

It is a super-2 number, since 2×105604021² = 22304418502736882, which contains 22 as substring.

Together with 105604019, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 105604021.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (105604721) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 52802010 + 52802011.

It is an arithmetic number, because the mean of its divisors is an integer number (52802011).

Almost surely, 2^105604021 is an apocalyptic number.

It is an amenable number.

105604021 is a deficient number, since it is larger than the sum of its proper divisors (1).

105604021 is an equidigital number, since it uses as much as digits as its factorization.

105604021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 240, while the sum is 19.

The square root of 105604021 is about 10276.3817075856. The cubic root of 105604021 is about 472.6722994517.

The spelling of 105604021 in words is "one hundred five million, six hundred four thousand, twenty-one".