6547470221 has 8 divisors (see below), whose sum is σ = 6616746360. Its totient is φ = 6478230528.

The previous prime is 6547470199. The next prime is 6547470269. The reversal of 6547470221 is 1220747456.

It can be written as a sum of positive squares in 4 ways, for example, as 2363320996 + 4184149225 = 48614^2 + 64685^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 6547470221 - 2¹⁴ = 6547453837 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6547470271) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 501545 + ... + 514433.

It is an arithmetic number, because the mean of its divisors is an integer number (827093295).

Almost surely, 2^6547470221 is an apocalyptic number.

It is an amenable number.

6547470221 is a deficient number, since it is larger than the sum of its proper divisors (69276139).

6547470221 is a wasteful number, since it uses less digits than its factorization.

6547470221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18223.

The product of its (nonzero) digits is 94080, while the sum is 38.

The square root of 6547470221 is about 80916.4397449616. The cubic root of 6547470221 is about 1870.7877205035.

The spelling of 6547470221 in words is "six billion, five hundred forty-seven million, four hundred seventy thousand, two hundred twenty-one".