21200000022209 has 2 divisors, whose sum is σ = 21200000022210. Its totient is φ = 21200000022208.

The previous prime is 21200000022199. The next prime is 21200000022287. The reversal of 21200000022209 is 90222000000212.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16828889903809 + 4371110118400 = 4102303^2 + 2090720^2 .

It is a cyclic number.

It is not a de Polignac number, because 21200000022209 - 2⁸ = 21200000021953 is a prime.

It is not a weakly prime, because it can be changed into another prime (21200000024209) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10600000011104 + 10600000011105.

It is an arithmetic number, because the mean of its divisors is an integer number (10600000011105).

Almost surely, 2^{21200000022209} is an apocalyptic number.

It is an amenable number.

21200000022209 is a deficient number, since it is larger than the sum of its proper divisors (1).

21200000022209 is an equidigital number, since it uses as much as digits as its factorization.

21200000022209 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 21200000022209 in words is "twenty-one trillion, two hundred billion, twenty-two thousand, two hundred nine".