20111121343 has 4 divisors (see below), whose sum is σ = 20115084528. Its totient is φ = 20107158160.

The previous prime is 20111121341. The next prime is 20111121379. The reversal of 20111121343 is 34312111102.

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 20111121343 - 2¹ = 20111121341 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20111121343.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20111121341) 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, 1973971 + ... + 1984132.

It is an arithmetic number, because the mean of its divisors is an integer number (5028771132).

Almost surely, 2^20111121343 is an apocalyptic number.

20111121343 is a deficient number, since it is larger than the sum of its proper divisors (3963185).

20111121343 is an equidigital number, since it uses as much as digits as its factorization.

20111121343 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3963184.

The product of its (nonzero) digits is 144, while the sum is 19.

Adding to 20111121343 its reverse (34312111102), we get a palindrome (54423232445).

The spelling of 20111121343 in words is "twenty billion, one hundred eleven million, one hundred twenty-one thousand, three hundred forty-three".