20971560018371 has 4 divisors (see below), whose sum is σ = 20993846480544. Its totient is φ = 20949273556200.

The previous prime is 20971560018349. The next prime is 20971560018373. The reversal of 20971560018371 is 17381006517902.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20971560018371 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20971560018373) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11143229675 + ... + 11143231556.

It is an arithmetic number, because the mean of its divisors is an integer number (5248461620136).

Almost surely, 2^{20971560018371} is an apocalyptic number.

20971560018371 is a deficient number, since it is larger than the sum of its proper divisors (22286462173).

20971560018371 is an equidigital number, since it uses as much as digits as its factorization.

20971560018371 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22286462172.

The product of its (nonzero) digits is 635040, while the sum is 50.

The spelling of 20971560018371 in words is "twenty trillion, nine hundred seventy-one billion, five hundred sixty million, eighteen thousand, three hundred seventy-one".