8471565421 has 16 divisors (see below), whose sum is σ = 9437342400. Its totient is φ = 7539051520.

The previous prime is 8471565373. The next prime is 8471565437. The reversal of 8471565421 is 1245651748.

It is not a de Polignac number, because 8471565421 - 2¹⁹ = 8471041133 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8471565451) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 245586 + ... + 277948.

It is an arithmetic number, because the mean of its divisors is an integer number (589833900).

Almost surely, 2^8471565421 is an apocalyptic number.

It is an amenable number.

8471565421 is a deficient number, since it is larger than the sum of its proper divisors (965776979).

8471565421 is a wasteful number, since it uses less digits than its factorization.

8471565421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32876.

The product of its digits is 268800, while the sum is 43.

The square root of 8471565421 is about 92041.1072347568. The cubic root of 8471565421 is about 2038.5493195464.

The spelling of 8471565421 in words is "eight billion, four hundred seventy-one million, five hundred sixty-five thousand, four hundred twenty-one".