20111211201011 has 4 divisors (see below), whose sum is σ = 22984241372592. Its totient is φ = 17238181029432.

The previous prime is 20111211201001. The next prime is 20111211201071. The reversal of 20111211201011 is 11010211211102.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 20111211201011 - 2¹⁰ = 20111211199987 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20111211201001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1436515085780 + ... + 1436515085793.

It is an arithmetic number, because the mean of its divisors is an integer number (5746060343148).

Almost surely, 2^{20111211201011} is an apocalyptic number.

20111211201011 is a deficient number, since it is larger than the sum of its proper divisors (2873030171581).

20111211201011 is an equidigital number, since it uses as much as digits as its factorization.

20111211201011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2873030171580.

The product of its (nonzero) digits is 8, while the sum is 14.

Adding to 20111211201011 its reverse (11010211211102), we get a palindrome (31121422412113).

The spelling of 20111211201011 in words is "twenty trillion, one hundred eleven billion, two hundred eleven million, two hundred one thousand, eleven".