20111020202111 has 4 divisors (see below), whose sum is σ = 20125395486000. Its totient is φ = 20096644918224.

The previous prime is 20111020202099. The next prime is 20111020202113. The reversal of 20111020202111 is 11120202011102.

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 20111020202111 - 2³⁰ = 20109946460287 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20111020202113) 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, 7187639846 + ... + 7187642643.

It is an arithmetic number, because the mean of its divisors is an integer number (5031348871500).

Almost surely, 2^{20111020202111} is an apocalyptic number.

20111020202111 is a deficient number, since it is larger than the sum of its proper divisors (14375283889).

20111020202111 is a wasteful number, since it uses less digits than its factorization.

20111020202111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14375283888.

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 20111020202111 its reverse (11120202011102), we get a palindrome (31231222213213).

The spelling of 20111020202111 in words is "twenty trillion, one hundred eleven billion, twenty million, two hundred two thousand, one hundred eleven".