20211211110001 has 2 divisors, whose sum is σ = 20211211110002. Its totient is φ = 20211211110000.

The previous prime is 20211211109963. The next prime is 20211211110023. The reversal of 20211211110001 is 10001111211202.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19992702542400 + 218508567601 = 4471320^2 + 467449^2 .

It is a cyclic number.

It is not a de Polignac number, because 20211211110001 - 2³³ = 20202621175409 is a prime.

It is not a weakly prime, because it can be changed into another prime (20211211110071) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10105605555000 + 10105605555001.

It is an arithmetic number, because the mean of its divisors is an integer number (10105605555001).

Almost surely, 2^{20211211110001} is an apocalyptic number.

It is an amenable number.

20211211110001 is a deficient number, since it is larger than the sum of its proper divisors (1).

20211211110001 is an equidigital number, since it uses as much as digits as its factorization.

20211211110001 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8, while the sum is 13.

Adding to 20211211110001 its reverse (10001111211202), we get a palindrome (30212322321203).

The spelling of 20211211110001 in words is "twenty trillion, two hundred eleven billion, two hundred eleven million, one hundred ten thousand, one".