20111121101 has 4 divisors (see below), whose sum is σ = 20114505372. Its totient is φ = 20107736832.

The previous prime is 20111121097. The next prime is 20111121103. The reversal of 20111121101 is 10112111102.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 7551436201 + 12559684900 = 86899^2 + 112070^2 .

It is a cyclic number.

It is not a de Polignac number, because 20111121101 - 2² = 20111121097 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 (20111121103) 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, 1683206 + ... + 1695111.

It is an arithmetic number, because the mean of its divisors is an integer number (5028626343).

Almost surely, 2^20111121101 is an apocalyptic number.

It is an amenable number.

20111121101 is a deficient number, since it is larger than the sum of its proper divisors (3384271).

20111121101 is an equidigital number, since it uses as much as digits as its factorization.

20111121101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3384270.

The product of its (nonzero) digits is 4, while the sum is 11.

Adding to 20111121101 its reverse (10112111102), we get a palindrome (30223232203).

Subtracting from 20111121101 its reverse (10112111102), we obtain a palindrome (9999009999).

The spelling of 20111121101 in words is "twenty billion, one hundred eleven million, one hundred twenty-one thousand, one hundred one".