20210101201111 has 4 divisors (see below), whose sum is σ = 20217235020112. Its totient is φ = 20202967382112.

The previous prime is 20210101201109. The next prime is 20210101201127. The reversal of 20210101201111 is 11110210101202.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 20210101201111 - 2¹ = 20210101201109 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20210101201091 and 20210101201100.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20210101201811) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3566905251 + ... + 3566910916.

It is an arithmetic number, because the mean of its divisors is an integer number (5054308755028).

Almost surely, 2^{20210101201111} is an apocalyptic number.

20210101201111 is a deficient number, since it is larger than the sum of its proper divisors (7133819001).

20210101201111 is an equidigital number, since it uses as much as digits as its factorization.

20210101201111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7133819000.

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

Adding to 20210101201111 its reverse (11110210101202), we get a palindrome (31320311302313).

The spelling of 20210101201111 in words is "twenty trillion, two hundred ten billion, one hundred one million, two hundred one thousand, one hundred eleven".