20971761243 has 8 divisors (see below), whose sum is σ = 27963049488. Its totient is φ = 13980823584.

The previous prime is 20971761241. The next prime is 20971761269. The reversal of 20971761243 is 34216717902.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 20971761243 - 2¹ = 20971761241 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20971761195 and 20971761204.

It is not an unprimeable number, because it can be changed into a prime (20971761241) 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 7 ways as a sum of consecutive naturals, for example, 127105 + ... + 241037.

It is an arithmetic number, because the mean of its divisors is an integer number (3495381186).

Almost surely, 2^20971761243 is an apocalyptic number.

20971761243 is a deficient number, since it is larger than the sum of its proper divisors (6991288245).

20971761243 is a wasteful number, since it uses less digits than its factorization.

20971761243 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 175293.

The product of its (nonzero) digits is 127008, while the sum is 42.

The spelling of 20971761243 in words is "twenty billion, nine hundred seventy-one million, seven hundred sixty-one thousand, two hundred forty-three".