20001211211 has 2 divisors, whose sum is σ = 20001211212. Its totient is φ = 20001211210.

The previous prime is 20001211199. The next prime is 20001211273. The reversal of 20001211211 is 11211210002.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20001211211 - 2⁶ = 20001211147 is a prime.

It is a Sophie Germain prime.

It is a junction number, because it is equal to n+sod(n) for n = 20001211192 and 20001211201.

It is not a weakly prime, because it can be changed into another prime (20001219211) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10000605605 + 10000605606.

It is an arithmetic number, because the mean of its divisors is an integer number (10000605606).

Almost surely, 2^20001211211 is an apocalyptic number.

20001211211 is a deficient number, since it is larger than the sum of its proper divisors (1).

20001211211 is an equidigital number, since it uses as much as digits as its factorization.

20001211211 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8, while the sum is 11.

Adding to 20001211211 its reverse (11211210002), we get a palindrome (31212421213).

The spelling of 20001211211 in words is "twenty billion, one million, two hundred eleven thousand, two hundred eleven".