105710021 has 2 divisors, whose sum is σ = 105710022. Its totient is φ = 105710020.

The previous prime is 105709997. The next prime is 105710051. The reversal of 105710021 is 120017501.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 95277121 + 10432900 = 9761^2 + 3230^2 .

It is a cyclic number.

It is not a de Polignac number, because 105710021 - 2¹⁰ = 105708997 is a prime.

It is a super-2 number, since 2×105710021² = 22349217079640882, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (105710051) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 52855010 + 52855011.

It is an arithmetic number, because the mean of its divisors is an integer number (52855011).

Almost surely, 2^105710021 is an apocalyptic number.

It is an amenable number.

105710021 is a deficient number, since it is larger than the sum of its proper divisors (1).

105710021 is an equidigital number, since it uses as much as digits as its factorization.

105710021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 70, while the sum is 17.

The square root of 105710021 is about 10281.5378713498. The cubic root of 105710021 is about 472.8303947872.

Adding to 105710021 its reverse (120017501), we get a palindrome (225727522).

The spelling of 105710021 in words is "one hundred five million, seven hundred ten thousand, twenty-one".