20011111122111 has 8 divisors (see below), whose sum is σ = 27841545909120. Its totient is φ = 12760708541592.

The previous prime is 20011111122103. The next prime is 20011111122113. The reversal of 20011111122111 is 11122111111002.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 20011111122111 - 2³ = 20011111122103 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20011111122113) 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 7 ways as a sum of consecutive naturals, for example, 145008051541 + ... + 145008051678.

It is an arithmetic number, because the mean of its divisors is an integer number (3480193238640).

Almost surely, 2^{20011111122111} is an apocalyptic number.

20011111122111 is a deficient number, since it is larger than the sum of its proper divisors (7830434787009).

20011111122111 is a wasteful number, since it uses less digits than its factorization.

20011111122111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 290016103245.

The product of its (nonzero) digits is 8, while the sum is 15.

Adding to 20011111122111 its reverse (11122111111002), we get a palindrome (31133222233113).

The spelling of 20011111122111 in words is "twenty trillion, eleven billion, one hundred eleven million, one hundred twenty-two thousand, one hundred eleven".