21220011012209 has 2 divisors, whose sum is σ = 21220011012210. Its totient is φ = 21220011012208.

The previous prime is 21220011012199. The next prime is 21220011012247. The reversal of 21220011012209 is 90221011002212.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 21190186758400 + 29824253809 = 4603280^2 + 172697^2 .

It is a cyclic number.

It is not a de Polignac number, because 21220011012209 - 2¹² = 21220011008113 is a prime.

It is not a weakly prime, because it can be changed into another prime (21220011012259) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10610005506104 + 10610005506105.

It is an arithmetic number, because the mean of its divisors is an integer number (10610005506105).

Almost surely, 2^{21220011012209} is an apocalyptic number.

It is an amenable number.

21220011012209 is a deficient number, since it is larger than the sum of its proper divisors (1).

21220011012209 is an equidigital number, since it uses as much as digits as its factorization.

21220011012209 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 23.

The spelling of 21220011012209 in words is "twenty-one trillion, two hundred twenty billion, eleven million, twelve thousand, two hundred nine".