20211021110011 has 2 divisors, whose sum is σ = 20211021110012. Its totient is φ = 20211021110010.

The previous prime is 20211021109973. The next prime is 20211021110017. The reversal of 20211021110011 is 11001112011202.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20211021110011 - 2⁴³ = 11414928087803 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20211021109973 and 20211021110000.

It is not a weakly prime, because it can be changed into another prime (20211021110017) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10105510555005 + 10105510555006.

It is an arithmetic number, because the mean of its divisors is an integer number (10105510555006).

Almost surely, 2^{20211021110011} is an apocalyptic number.

20211021110011 is a deficient number, since it is larger than the sum of its proper divisors (1).

20211021110011 is an equidigital number, since it uses as much as digits as its factorization.

20211021110011 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 20211021110011 its reverse (11001112011202), we get a palindrome (31212133121213).

The spelling of 20211021110011 in words is "twenty trillion, two hundred eleven billion, twenty-one million, one hundred ten thousand, eleven".