210745105 has 4 divisors (see below), whose sum is σ = 252894132. Its totient is φ = 168596080.

The previous prime is 210745097. The next prime is 210745121. The reversal of 210745105 is 501547012.

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 52287361 + 158457744 = 7231^2 + 12588^2 .

It is not a de Polignac number, because 210745105 - 2³ = 210745097 is a prime.

It is a super-2 number, since 2×210745105² = 88826998562922050, which contains 22 as substring.

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 210745105.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21074506 + ... + 21074515.

It is an arithmetic number, because the mean of its divisors is an integer number (63223533).

Almost surely, 2^210745105 is an apocalyptic number.

It is an amenable number.

210745105 is a deficient number, since it is larger than the sum of its proper divisors (42149027).

210745105 is an equidigital number, since it uses as much as digits as its factorization.

210745105 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42149026.

The product of its (nonzero) digits is 1400, while the sum is 25.

The square root of 210745105 is about 14517.0625472235. The cubic root of 210745105 is about 595.0943569022.

The spelling of 210745105 in words is "two hundred ten million, seven hundred forty-five thousand, one hundred five".