20211111101 has 4 divisors (see below), whose sum is σ = 20212422204. Its totient is φ = 20209800000.

The previous prime is 20211111073. The next prime is 20211111203. The reversal of 20211111101 is 10111111202.

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 16304736100 + 3906375001 = 127690^2 + 62501^2 .

It is a cyclic number.

It is not a de Polignac number, because 20211111101 - 2²⁶ = 20144002237 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 (20211119101) 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, 632150 + ... + 663351.

It is an arithmetic number, because the mean of its divisors is an integer number (5053105551).

Almost surely, 2^20211111101 is an apocalyptic number.

It is an amenable number.

20211111101 is a deficient number, since it is larger than the sum of its proper divisors (1311103).

20211111101 is a wasteful number, since it uses less digits than its factorization.

20211111101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1311102.

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

Adding to 20211111101 its reverse (10111111202), we get a palindrome (30322222303).

The spelling of 20211111101 in words is "twenty billion, two hundred eleven million, one hundred eleven thousand, one hundred one".