20011020212111 has 4 divisors (see below), whose sum is σ = 20011071925872. Its totient is φ = 20010968498352.

The previous prime is 20011020212041. The next prime is 20011020212137. The reversal of 20011020212111 is 11121202011002.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20011020212111 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 (20011020202111) 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, 25272035 + ... + 26051828.

It is an arithmetic number, because the mean of its divisors is an integer number (5002767981468).

Almost surely, 2^{20011020212111} is an apocalyptic number.

20011020212111 is a deficient number, since it is larger than the sum of its proper divisors (51713761).

20011020212111 is an equidigital number, since it uses as much as digits as its factorization.

20011020212111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51713760.

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

Adding to 20011020212111 its reverse (11121202011002), we get a palindrome (31132222223113).

The spelling of 20011020212111 in words is "twenty trillion, eleven billion, twenty million, two hundred twelve thousand, one hundred eleven".