20011108211 has 2 divisors, whose sum is σ = 20011108212. Its totient is φ = 20011108210.

The previous prime is 20011108147. The next prime is 20011108223. The reversal of 20011108211 is 11280111002.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20011108211 - 2⁶ = 20011108147 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20011108211.

It is not a weakly prime, because it can be changed into another prime (20011108511) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10005554105 + 10005554106.

It is an arithmetic number, because the mean of its divisors is an integer number (10005554106).

Almost surely, 2^20011108211 is an apocalyptic number.

20011108211 is a deficient number, since it is larger than the sum of its proper divisors (1).

20011108211 is an equidigital number, since it uses as much as digits as its factorization.

20011108211 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 32, while the sum is 17.

Adding to 20011108211 its reverse (11280111002), we get a palindrome (31291219213).

The spelling of 20011108211 in words is "twenty billion, eleven million, one hundred eight thousand, two hundred eleven".