20111321340243 has 24 divisors (see below), whose sum is σ = 33743898003296. Its totient is φ = 11303787168000.

The previous prime is 20111321340233. The next prime is 20111321340247. The reversal of 20111321340243 is 34204312311102.

20111321340243 is a `hidden beast` number, since 2 + 0 + 1 + 1 + 1 + 3 + 213 + 402 + 43 = 666.

It is not a de Polignac number, because 20111321340243 - 2²⁵ = 20111287785811 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20111321340247) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2616613558 + ... + 2616621243.

Almost surely, 2^{20111321340243} is an apocalyptic number.

20111321340243 is a deficient number, since it is larger than the sum of its proper divisors (13632576663053).

20111321340243 is a wasteful number, since it uses less digits than its factorization.

20111321340243 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5233234875 (or 5233234872 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 27.

Adding to 20111321340243 its reverse (34204312311102), we get a palindrome (54315633651345).

The spelling of 20111321340243 in words is "twenty trillion, one hundred eleven billion, three hundred twenty-one million, three hundred forty thousand, two hundred forty-three".