21023322209 has 2 divisors, whose sum is σ = 21023322210. Its totient is φ = 21023322208.

The previous prime is 21023322197. The next prime is 21023322223. The reversal of 21023322209 is 90222332012.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13818707809 + 7204614400 = 117553^2 + 84880^2 .

It is a cyclic number.

It is not a de Polignac number, because 21023322209 - 2⁴ = 21023322193 is a prime.

It is not a weakly prime, because it can be changed into another prime (21023322269) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10511661104 + 10511661105.

It is an arithmetic number, because the mean of its divisors is an integer number (10511661105).

Almost surely, 2^21023322209 is an apocalyptic number.

It is an amenable number.

21023322209 is a deficient number, since it is larger than the sum of its proper divisors (1).

21023322209 is an equidigital number, since it uses as much as digits as its factorization.

21023322209 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2592, while the sum is 26.

The spelling of 21023322209 in words is "twenty-one billion, twenty-three million, three hundred twenty-two thousand, two hundred nine".