20211211100011 has 2 divisors, whose sum is σ = 20211211100012. Its totient is φ = 20211211100010.

The previous prime is 20211211099909. The next prime is 20211211100021. The reversal of 20211211100011 is 11000111211202.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20211211100011 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20211211099964 and 20211211100000.

It is not a weakly prime, because it can be changed into another prime (20211211100021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10105605550005 + 10105605550006.

It is an arithmetic number, because the mean of its divisors is an integer number (10105605550006).

Almost surely, 2^{20211211100011} is an apocalyptic number.

20211211100011 is a deficient number, since it is larger than the sum of its proper divisors (1).

20211211100011 is an equidigital number, since it uses as much as digits as its factorization.

20211211100011 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 13.

Adding to 20211211100011 its reverse (11000111211202), we get a palindrome (31211322311213).

The spelling of 20211211100011 in words is "twenty trillion, two hundred eleven billion, two hundred eleven million, one hundred thousand, eleven".