210223209509 has 2 divisors, whose sum is σ = 210223209510. Its totient is φ = 210223209508.

The previous prime is 210223209491. The next prime is 210223209523. The reversal of 210223209509 is 905902322012.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 208258060609 + 1965148900 = 456353^2 + 44330^2 .

It is a cyclic number.

It is not a de Polignac number, because 210223209509 - 2⁸ = 210223209253 is a prime.

It is a super-3 number, since 3×210223209509³ (a number of 35 digits) contains 333 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (210223209529) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105111604754 + 105111604755.

It is an arithmetic number, because the mean of its divisors is an integer number (105111604755).

Almost surely, 2^210223209509 is an apocalyptic number.

It is an amenable number.

210223209509 is a deficient number, since it is larger than the sum of its proper divisors (1).

210223209509 is an equidigital number, since it uses as much as digits as its factorization.

210223209509 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 19440, while the sum is 35.

The spelling of 210223209509 in words is "two hundred ten billion, two hundred twenty-three million, two hundred nine thousand, five hundred nine".