20122100111 has 4 divisors (see below), whose sum is σ = 20397745392. Its totient is φ = 19846454832.

The previous prime is 20122100101. The next prime is 20122100113. The reversal of 20122100111 is 11100122102.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20122100111 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20122100092 and 20122100101.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20122100113) 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, 137822531 + ... + 137822676.

It is an arithmetic number, because the mean of its divisors is an integer number (5099436348).

Almost surely, 2^20122100111 is an apocalyptic number.

20122100111 is a deficient number, since it is larger than the sum of its proper divisors (275645281).

20122100111 is an equidigital number, since it uses as much as digits as its factorization.

20122100111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 275645280.

The product of its (nonzero) digits is 8, while the sum is 11.

Adding to 20122100111 its reverse (11100122102), we get a palindrome (31222222213).

The spelling of 20122100111 in words is "twenty billion, one hundred twenty-two million, one hundred thousand, one hundred eleven".