20012101121 has 4 divisors (see below), whose sum is σ = 20144631744. Its totient is φ = 19879570500.

The previous prime is 20012101117. The next prime is 20012101129. The reversal of 20012101121 is 12110121002.

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 20012101121 - 2² = 20012101117 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20012101129) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 66265085 + ... + 66265386.

It is an arithmetic number, because the mean of its divisors is an integer number (5036157936).

Almost surely, 2^20012101121 is an apocalyptic number.

It is an amenable number.

20012101121 is a deficient number, since it is larger than the sum of its proper divisors (132530623).

20012101121 is a wasteful number, since it uses less digits than its factorization.

20012101121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 132530622.

The product of its (nonzero) digits is 8, while the sum is 11.

Adding to 20012101121 its reverse (12110121002), we get a palindrome (32122222123).

The spelling of 20012101121 in words is "twenty billion, twelve million, one hundred one thousand, one hundred twenty-one".