6417420821 has 8 divisors (see below), whose sum is σ = 7334861184. Its totient is φ = 5500146960.

The previous prime is 6417420803. The next prime is 6417420833. The reversal of 6417420821 is 1280247146.

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

It is a de Polignac number, because none of the positive numbers 2^k-6417420821 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6417120821) 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, 56351 + ... + 126531.

It is an arithmetic number, because the mean of its divisors is an integer number (916857648).

Almost surely, 2^6417420821 is an apocalyptic number.

It is an amenable number.

6417420821 is a deficient number, since it is larger than the sum of its proper divisors (917440363).

6417420821 is a wasteful number, since it uses less digits than its factorization.

6417420821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 83251.

The product of its (nonzero) digits is 21504, while the sum is 35.

The square root of 6417420821 is about 80108.8061389009. The cubic root of 6417420821 is about 1858.3185966045.

Adding to 6417420821 its reverse (1280247146), we get a palindrome (7697667967).

The spelling of 6417420821 in words is "six billion, four hundred seventeen million, four hundred twenty thousand, eight hundred twenty-one".