20111042311309 has 2 divisors, whose sum is σ = 20111042311310. Its totient is φ = 20111042311308.

The previous prime is 20111042311301. The next prime is 20111042311397. The reversal of 20111042311309 is 90311324011102.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12245429426409 + 7865612884900 = 3499347^2 + 2804570^2 .

It is a cyclic number.

It is not a de Polignac number, because 20111042311309 - 2³ = 20111042311301 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20111042311301) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10055521155654 + 10055521155655.

It is an arithmetic number, because the mean of its divisors is an integer number (10055521155655).

Almost surely, 2^{20111042311309} is an apocalyptic number.

It is an amenable number.

20111042311309 is a deficient number, since it is larger than the sum of its proper divisors (1).

20111042311309 is an equidigital number, since it uses as much as digits as its factorization.

20111042311309 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1296, while the sum is 28.

The spelling of 20111042311309 in words is "twenty trillion, one hundred eleven billion, forty-two million, three hundred eleven thousand, three hundred nine".