21222211022209 has 2 divisors, whose sum is σ = 21222211022210. Its totient is φ = 21222211022208.

The previous prime is 21222211022197. The next prime is 21222211022213. The reversal of 21222211022209 is 90222011222212.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20538162929025 + 684048093184 = 4531905^2 + 827072^2 .

It is a cyclic number.

It is not a de Polignac number, because 21222211022209 - 2⁴³ = 12426118000001 is a prime.

It is not a weakly prime, because it can be changed into another prime (21222211026209) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10611105511104 + 10611105511105.

It is an arithmetic number, because the mean of its divisors is an integer number (10611105511105).

Almost surely, 2^{21222211022209} is an apocalyptic number.

It is an amenable number.

21222211022209 is a deficient number, since it is larger than the sum of its proper divisors (1).

21222211022209 is an equidigital number, since it uses as much as digits as its factorization.

21222211022209 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2304, while the sum is 28.

The spelling of 21222211022209 in words is "twenty-one trillion, two hundred twenty-two billion, two hundred eleven million, twenty-two thousand, two hundred nine".