20011112121101 has 4 divisors (see below), whose sum is σ = 20031806136672. Its totient is φ = 19990418105532.

The previous prime is 20011112121083. The next prime is 20011112121107. The reversal of 20011112121101 is 10112121111002.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 20011112121101 - 2¹⁸ = 20011111858957 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 (20011112121107) 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, 10347006335 + ... + 10347008268.

It is an arithmetic number, because the mean of its divisors is an integer number (5007951534168).

Almost surely, 2^{20011112121101} is an apocalyptic number.

It is an amenable number.

20011112121101 is a deficient number, since it is larger than the sum of its proper divisors (20694015571).

20011112121101 is an equidigital number, since it uses as much as digits as its factorization.

20011112121101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20694015570.

The product of its (nonzero) digits is 8, while the sum is 14.

Adding to 20011112121101 its reverse (10112121111002), we get a palindrome (30123233232103).

The spelling of 20011112121101 in words is "twenty trillion, eleven billion, one hundred twelve million, one hundred twenty-one thousand, one hundred one".