20111001012111 has 8 divisors (see below), whose sum is σ = 26815528716160. Its totient is φ = 13406903658072.

The previous prime is 20111001012107. The next prime is 20111001012161. The reversal of 20111001012111 is 11121010011102.

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

It is not a de Polignac number, because 20111001012111 - 2² = 20111001012107 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 (20111001012161) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 107478445 + ... + 107665398.

It is an arithmetic number, because the mean of its divisors is an integer number (3351941089520).

Almost surely, 2^{20111001012111} is an apocalyptic number.

20111001012111 is a deficient number, since it is larger than the sum of its proper divisors (6704527704049).

20111001012111 is a wasteful number, since it uses less digits than its factorization.

20111001012111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 215175005.

The product of its (nonzero) digits is 4, while the sum is 12.

Adding to 20111001012111 its reverse (11121010011102), we get a palindrome (31232011023213).

The spelling of 20111001012111 in words is "twenty trillion, one hundred eleven billion, one million, twelve thousand, one hundred eleven".