20311042211 has 4 divisors (see below), whose sum is σ = 20327650992. Its totient is φ = 20294433432.

The previous prime is 20311042187. The next prime is 20311042231. The reversal of 20311042211 is 11224011302.

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 20311042211 - 2¹⁴ = 20311025827 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20311042211.

It is not an unprimeable number, because it can be changed into a prime (20311042231) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8302556 + ... + 8305001.

It is an arithmetic number, because the mean of its divisors is an integer number (5081912748).

Almost surely, 2^20311042211 is an apocalyptic number.

20311042211 is a deficient number, since it is larger than the sum of its proper divisors (16608781).

20311042211 is a wasteful number, since it uses less digits than its factorization.

20311042211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16608780.

The product of its (nonzero) digits is 96, while the sum is 17.

Adding to 20311042211 its reverse (11224011302), we get a palindrome (31535053513).

It can be divided in two parts, 2031104 and 2211, that multiplied together give a palindrome (4490770944).

The spelling of 20311042211 in words is "twenty billion, three hundred eleven million, forty-two thousand, two hundred eleven".