20122111 has 4 divisors (see below), whose sum is σ = 20195032. Its totient is φ = 20049192.

The previous prime is 20122093. The next prime is 20122133. The reversal of 20122111 is 11122102.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 11122102 = 2 ⋅5561051.

It is a cyclic number.

It is not a de Polignac number, because 20122111 - 2¹¹ = 20120063 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 (20122511) 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, 36045 + ... + 36598.

It is an arithmetic number, because the mean of its divisors is an integer number (5048758).

Almost surely, 2^20122111 is an apocalyptic number.

20122111 is a deficient number, since it is larger than the sum of its proper divisors (72921).

20122111 is an equidigital number, since it uses as much as digits as its factorization.

20122111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 72920.

The product of its (nonzero) digits is 8, while the sum is 10.

The square root of 20122111 is about 4485.7676043237. The cubic root of 20122111 is about 271.9930749030.

Adding to 20122111 its reverse (11122102), we get a palindrome (31244213).

Subtracting from 20122111 its reverse (11122102), we obtain a palindrome (9000009).

The spelling of 20122111 in words is "twenty million, one hundred twenty-two thousand, one hundred eleven".