210221264243 has 4 divisors (see below), whose sum is σ = 210827089560. Its totient is φ = 209615438928.

The previous prime is 210221264237. The next prime is 210221264249. The reversal of 210221264243 is 342462122012.

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

It is an interprime number because it is at equal distance from previous prime (210221264237) and next prime (210221264249).

It is a cyclic number.

It is not a de Polignac number, because 210221264243 - 2²² = 210217069939 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (210221264249) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 302912138 + ... + 302912831.

It is an arithmetic number, because the mean of its divisors is an integer number (52706772390).

Almost surely, 2^210221264243 is an apocalyptic number.

210221264243 is a deficient number, since it is larger than the sum of its proper divisors (605825317).

210221264243 is an equidigital number, since it uses as much as digits as its factorization.

210221264243 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 605825316.

The product of its (nonzero) digits is 9216, while the sum is 29.

Adding to 210221264243 its reverse (342462122012), we get a palindrome (552683386255).

The spelling of 210221264243 in words is "two hundred ten billion, two hundred twenty-one million, two hundred sixty-four thousand, two hundred forty-three".