20211101111 has 4 divisors (see below), whose sum is σ = 20212012224. Its totient is φ = 20210190000.

The previous prime is 20211101107. The next prime is 20211101153. The reversal of 20211101111 is 11110111202.

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

It is a cyclic number.

It is not a de Polignac number, because 20211101111 - 2² = 20211101107 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20211101092 and 20211101101.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20211101161) 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, 421430 + ... + 466931.

It is an arithmetic number, because the mean of its divisors is an integer number (5053003056).

Almost surely, 2^20211101111 is an apocalyptic number.

20211101111 is a deficient number, since it is larger than the sum of its proper divisors (911113).

20211101111 is an equidigital number, since it uses as much as digits as its factorization.

20211101111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 911112.

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

Adding to 20211101111 its reverse (11110111202), we get a palindrome (31321212313).

The spelling of 20211101111 in words is "twenty billion, two hundred eleven million, one hundred one thousand, one hundred eleven".