21222200009 has 2 divisors, whose sum is σ = 21222200010. Its totient is φ = 21222200008.

The previous prime is 21222199993. The next prime is 21222200011. The reversal of 21222200009 is 90000222212.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14208640000 + 7013560009 = 119200^2 + 83747^2 .

It is a cyclic number.

It is not a de Polignac number, because 21222200009 - 2⁴ = 21222199993 is a prime.

Together with 21222200011, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (21222200039) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10611100004 + 10611100005.

It is an arithmetic number, because the mean of its divisors is an integer number (10611100005).

Almost surely, 2^21222200009 is an apocalyptic number.

It is an amenable number.

21222200009 is a deficient number, since it is larger than the sum of its proper divisors (1).

21222200009 is an equidigital number, since it uses as much as digits as its factorization.

21222200009 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 288, while the sum is 20.

The spelling of 21222200009 in words is "twenty-one billion, two hundred twenty-two million, two hundred thousand, nine".