20111111202209 has 2 divisors, whose sum is σ = 20111111202210. Its totient is φ = 20111111202208.

The previous prime is 20111111202113. The next prime is 20111111202251. The reversal of 20111111202209 is 90220211111102.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 13522792702225 + 6588318499984 = 3677335^2 + 2566772^2 .

It is a cyclic number.

It is not a de Polignac number, because 20111111202209 - 2²⁸ = 20110842766753 is a prime.

It is not a weakly prime, because it can be changed into another prime (20111111202509) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10055555601104 + 10055555601105.

It is an arithmetic number, because the mean of its divisors is an integer number (10055555601105).

Almost surely, 2^{20111111202209} is an apocalyptic number.

It is an amenable number.

20111111202209 is a deficient number, since it is larger than the sum of its proper divisors (1).

20111111202209 is an equidigital number, since it uses as much as digits as its factorization.

20111111202209 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 144, while the sum is 23.

The spelling of 20111111202209 in words is "twenty trillion, one hundred eleven billion, one hundred eleven million, two hundred two thousand, two hundred nine".