47471569921 has 4 divisors (see below), whose sum is σ = 47513618500. Its totient is φ = 47429521344.

The previous prime is 47471569907. The next prime is 47471569933. The reversal of 47471569921 is 12996517474.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12996517474 = 2 ⋅6498258737.

It can be written as a sum of positive squares in 2 ways, for example, as 1435576321 + 46035993600 = 37889^2 + 214560^2 .

It is a cyclic number.

It is not a de Polignac number, because 47471569921 - 2⁵ = 47471569889 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (47471569991) 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, 21022596 + ... + 21024853.

It is an arithmetic number, because the mean of its divisors is an integer number (11878404625).

Almost surely, 2^47471569921 is an apocalyptic number.

It is an amenable number.

47471569921 is a deficient number, since it is larger than the sum of its proper divisors (42048579).

47471569921 is a wasteful number, since it uses less digits than its factorization.

47471569921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42048578.

The product of its digits is 3810240, while the sum is 55.

The spelling of 47471569921 in words is "forty-seven billion, four hundred seventy-one million, five hundred sixty-nine thousand, nine hundred twenty-one".