20101211200111 has 4 divisors (see below), whose sum is σ = 20172745759824. Its totient is φ = 20029676640400.

The previous prime is 20101211200079. The next prime is 20101211200117. The reversal of 20101211200111 is 11100211210102.

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 20101211200111 - 2⁵ = 20101211200079 is a prime.

It is a super-2 number, since 2×20101211200111² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20101211200091 and 20101211200100.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20101211200117) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 35767279435 + ... + 35767279996.

It is an arithmetic number, because the mean of its divisors is an integer number (5043186439956).

Almost surely, 2^{20101211200111} is an apocalyptic number.

20101211200111 is a deficient number, since it is larger than the sum of its proper divisors (71534559713).

20101211200111 is an equidigital number, since it uses as much as digits as its factorization.

20101211200111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71534559712.

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

Adding to 20101211200111 its reverse (11100211210102), we get a palindrome (31201422410213).

Subtracting from 20101211200111 its reverse (11100211210102), we obtain a palindrome (9000999990009).

The spelling of 20101211200111 in words is "twenty trillion, one hundred one billion, two hundred eleven million, two hundred thousand, one hundred eleven".