20112421111 has 4 divisors (see below), whose sum is σ = 20367008800. Its totient is φ = 19857833424.

The previous prime is 20112421099. The next prime is 20112421117. The reversal of 20112421111 is 11112421102.

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 20112421111 - 2³³ = 11522486519 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 (20112421117) 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, 127293726 + ... + 127293883.

It is an arithmetic number, because the mean of its divisors is an integer number (5091752200).

Almost surely, 2^20112421111 is an apocalyptic number.

20112421111 is a deficient number, since it is larger than the sum of its proper divisors (254587689).

20112421111 is an equidigital number, since it uses as much as digits as its factorization.

20112421111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 254587688.

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 20112421111 its reverse (11112421102), we get a palindrome (31224842213).

Subtracting from 20112421111 its reverse (11112421102), we obtain a palindrome (9000000009).

The spelling of 20112421111 in words is "twenty billion, one hundred twelve million, four hundred twenty-one thousand, one hundred eleven".