210868643 has 4 divisors (see below), whose sum is σ = 214325568. Its totient is φ = 207411720.

The previous prime is 210868639. The next prime is 210868681. The reversal of 210868643 is 346868012.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 210868643 - 2² = 210868639 is a prime.

It is a super-2 number, since 2×210868643² = 88931169201322898, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 210868597 and 210868606.

It is not an unprimeable number, because it can be changed into a prime (210868613) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1728371 + ... + 1728492.

It is an arithmetic number, because the mean of its divisors is an integer number (53581392).

Almost surely, 2^210868643 is an apocalyptic number.

210868643 is a deficient number, since it is larger than the sum of its proper divisors (3456925).

210868643 is an equidigital number, since it uses as much as digits as its factorization.

210868643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3456924.

The product of its (nonzero) digits is 55296, while the sum is 38.

The square root of 210868643 is about 14521.3168479997. The cubic root of 210868643 is about 595.2106148911.

The spelling of 210868643 in words is "two hundred ten million, eight hundred sixty-eight thousand, six hundred forty-three".