20011121102209 has 2 divisors, whose sum is σ = 20011121102210. Its totient is φ = 20011121102208.

The previous prime is 20011121102197. The next prime is 20011121102233. The reversal of 20011121102209 is 90220112111002.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13444894225984 + 6566226876225 = 3666728^2 + 2562465^2 .

It is a cyclic number.

It is not a de Polignac number, because 20011121102209 - 2²³ = 20011112713601 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20011121102209.

It is not a weakly prime, because it can be changed into another prime (20011121102279) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10005560551104 + 10005560551105.

It is an arithmetic number, because the mean of its divisors is an integer number (10005560551105).

Almost surely, 2^{20011121102209} is an apocalyptic number.

It is an amenable number.

20011121102209 is a deficient number, since it is larger than the sum of its proper divisors (1).

20011121102209 is an equidigital number, since it uses as much as digits as its factorization.

20011121102209 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 144, while the sum is 22.

The spelling of 20011121102209 in words is "twenty trillion, eleven billion, one hundred twenty-one million, one hundred two thousand, two hundred nine".