20111102221121 has 4 divisors (see below), whose sum is σ = 20142379208112. Its totient is φ = 20079825234132.

The previous prime is 20111102221103. The next prime is 20111102221127. The reversal of 20111102221121 is 12112220111102.

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 20111102221121 - 2³⁰ = 20110028479297 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20111102221121.

It is not an unprimeable number, because it can be changed into a prime (20111102221127) 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, 15638492531 + ... + 15638493816.

It is an arithmetic number, because the mean of its divisors is an integer number (5035594802028).

Almost surely, 2^{20111102221121} is an apocalyptic number.

It is an amenable number.

20111102221121 is a deficient number, since it is larger than the sum of its proper divisors (31276986991).

20111102221121 is an equidigital number, since it uses as much as digits as its factorization.

20111102221121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31276986990.

The product of its (nonzero) digits is 32, while the sum is 17.

Adding to 20111102221121 its reverse (12112220111102), we get a palindrome (32223322332223).

The spelling of 20111102221121 in words is "twenty trillion, one hundred eleven billion, one hundred two million, two hundred twenty-one thousand, one hundred twenty-one".