210125005 has 4 divisors (see below), whose sum is σ = 252150012. Its totient is φ = 168100000.

The previous prime is 210124979. The next prime is 210125029. The reversal of 210125005 is 500521012.

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 150356644 + 59768361 = 12262^2 + 7731^2 .

It is a de Polignac number, because none of the positive numbers 2^k-210125005 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 210125005.

It is a congruent number.

It is an unprimeable number.

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 in 3 ways as a sum of consecutive naturals, for example, 21012496 + ... + 21012505.

It is an arithmetic number, because the mean of its divisors is an integer number (63037503).

Almost surely, 2^210125005 is an apocalyptic number.

It is an amenable number.

210125005 is a deficient number, since it is larger than the sum of its proper divisors (42025007).

210125005 is an equidigital number, since it uses as much as digits as its factorization.

210125005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42025006.

The product of its (nonzero) digits is 100, while the sum is 16.

The square root of 210125005 is about 14495.6891867893. The cubic root of 210125005 is about 594.5101115592.

Adding to 210125005 its reverse (500521012), we get a palindrome (710646017).

It can be divided in two parts, 21012500 and 5, that multiplied together give a square (105062500 = 10250²).

The spelling of 210125005 in words is "two hundred ten million, one hundred twenty-five thousand, five".