210123005 has 16 divisors (see below), whose sum is σ = 257513904. Its totient is φ = 164536320.

The previous prime is 210122989. The next prime is 210123007. The reversal of 210123005 is 500321012.

It is a happy number.

It can be written as a sum of positive squares in 8 ways, for example, as 33605209 + 176517796 = 5797^2 + 13286^2 .

It is not a de Polignac number, because 210123005 - 2⁴ = 210122989 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 (210123007) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 169247 + ... + 170483.

It is an arithmetic number, because the mean of its divisors is an integer number (16094619).

Almost surely, 2^210123005 is an apocalyptic number.

It is an amenable number.

210123005 is a deficient number, since it is larger than the sum of its proper divisors (47390899).

210123005 is a wasteful number, since it uses less digits than its factorization.

210123005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1936.

The product of its (nonzero) digits is 60, while the sum is 14.

The square root of 210123005 is about 14495.6202005985. The cubic root of 210123005 is about 594.5082253423.

Adding to 210123005 its reverse (500321012), we get a palindrome (710444017).

The spelling of 210123005 in words is "two hundred ten million, one hundred twenty-three thousand, five".