20111001012221 has 4 divisors (see below), whose sum is σ = 22984001156832. Its totient is φ = 17238000867612.

The previous prime is 20111001012209. The next prime is 20111001012241. The reversal of 20111001012221 is 12221010011102.

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 not a de Polignac number, because 20111001012221 - 2³⁰ = 20109927270397 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 20111001012196 and 20111001012205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20111001012241) 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 3 ways as a sum of consecutive naturals, for example, 1436500072295 + ... + 1436500072308.

It is an arithmetic number, because the mean of its divisors is an integer number (5746000289208).

Almost surely, 2^{20111001012221} is an apocalyptic number.

It is an amenable number.

20111001012221 is a deficient number, since it is larger than the sum of its proper divisors (2873000144611).

20111001012221 is an equidigital number, since it uses as much as digits as its factorization.

20111001012221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2873000144610.

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

Adding to 20111001012221 its reverse (12221010011102), we get a palindrome (32332011023323).

The spelling of 20111001012221 in words is "twenty trillion, one hundred eleven billion, one million, twelve thousand, two hundred twenty-one".