210223009 has 2 divisors, whose sum is σ = 210223010. Its totient is φ = 210223008.

The previous prime is 210222989. The next prime is 210223061. The reversal of 210223009 is 900322012.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 116035984 + 94187025 = 10772^2 + 9705^2 .

It is a cyclic number.

It is not a de Polignac number, because 210223009 - 2⁹ = 210222497 is a prime.

It is not a weakly prime, because it can be changed into another prime (210223099) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105111504 + 105111505.

It is an arithmetic number, because the mean of its divisors is an integer number (105111505).

Almost surely, 2^210223009 is an apocalyptic number.

It is an amenable number.

210223009 is a deficient number, since it is larger than the sum of its proper divisors (1).

210223009 is an equidigital number, since it uses as much as digits as its factorization.

210223009 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 216, while the sum is 19.

The square root of 210223009 is about 14499.0692459896. The cubic root of 210223009 is about 594.6025252996.

The spelling of 210223009 in words is "two hundred ten million, two hundred twenty-three thousand, nine".