20311303211 has 2 divisors, whose sum is σ = 20311303212. Its totient is φ = 20311303210.

The previous prime is 20311303169. The next prime is 20311303223. The reversal of 20311303211 is 11230311302.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20311303211 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20311303211.

It is not a weakly prime, because it can be changed into another prime (20311303241) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10155651605 + 10155651606.

It is an arithmetic number, because the mean of its divisors is an integer number (10155651606).

Almost surely, 2^20311303211 is an apocalyptic number.

20311303211 is a deficient number, since it is larger than the sum of its proper divisors (1).

20311303211 is an equidigital number, since it uses as much as digits as its factorization.

20311303211 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 108, while the sum is 17.

Adding to 20311303211 its reverse (11230311302), we get a palindrome (31541614513).

The spelling of 20311303211 in words is "twenty billion, three hundred eleven million, three hundred three thousand, two hundred eleven".