20121344111 has 4 divisors (see below), whose sum is σ = 21950557224. Its totient is φ = 18292131000.

The previous prime is 20121344101. The next prime is 20121344171. The reversal of 20121344111 is 11144312102.

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

It is not a de Polignac number, because 20121344111 - 2¹⁰ = 20121343087 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 (20121344101) 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, 914606540 + ... + 914606561.

It is an arithmetic number, because the mean of its divisors is an integer number (5487639306).

Almost surely, 2^20121344111 is an apocalyptic number.

20121344111 is a deficient number, since it is larger than the sum of its proper divisors (1829213113).

20121344111 is a wasteful number, since it uses less digits than its factorization.

20121344111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1829213112.

The product of its (nonzero) digits is 192, while the sum is 20.

Adding to 20121344111 its reverse (11144312102), we get a palindrome (31265656213).

It can be divided in two parts, 201 and 21344111, that added together give a palindrome (21344312).

The spelling of 20121344111 in words is "twenty billion, one hundred twenty-one million, three hundred forty-four thousand, one hundred eleven".