20971016427943 has 4 divisors (see below), whose sum is σ = 20981865377848. Its totient is φ = 20960167478040.

The previous prime is 20971016427941. The next prime is 20971016427961. The reversal of 20971016427943 is 34972461017902.

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 20971016427943 - 2¹ = 20971016427941 is a prime.

It is a super-2 number, since 2×20971016427943² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20971016427941) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5424472053 + ... + 5424475918.

It is an arithmetic number, because the mean of its divisors is an integer number (5245466344462).

Almost surely, 2^{20971016427943} is an apocalyptic number.

20971016427943 is a deficient number, since it is larger than the sum of its proper divisors (10848949905).

20971016427943 is a wasteful number, since it uses less digits than its factorization.

20971016427943 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10848949904.

The product of its (nonzero) digits is 4572288, while the sum is 55.

The spelling of 20971016427943 in words is "twenty trillion, nine hundred seventy-one billion, sixteen million, four hundred twenty-seven thousand, nine hundred forty-three".