6467381221 has 8 divisors (see below), whose sum is σ = 7399413504. Its totient is φ = 5537379120.

The previous prime is 6467381203. The next prime is 6467381237. The reversal of 6467381221 is 1221837646.

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

It is not a de Polignac number, because 6467381221 - 2²³ = 6458992613 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6467381251) 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, 500710 + ... + 513463.

It is an arithmetic number, because the mean of its divisors is an integer number (924926688).

Almost surely, 2^6467381221 is an apocalyptic number.

It is an amenable number.

6467381221 is a deficient number, since it is larger than the sum of its proper divisors (932032283).

6467381221 is a wasteful number, since it uses less digits than its factorization.

6467381221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1015091.

The product of its digits is 96768, while the sum is 40.

The square root of 6467381221 is about 80420.0299738815. The cubic root of 6467381221 is about 1863.1285480386.

The spelling of 6467381221 in words is "six billion, four hundred sixty-seven million, three hundred eighty-one thousand, two hundred twenty-one".