6448246221 has 4 divisors (see below), whose sum is σ = 8597661632. Its totient is φ = 4298830812.

The previous prime is 6448246187. The next prime is 6448246223. The reversal of 6448246221 is 1226428446.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 6448246221 - 2⁶ = 6448246157 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 6448246221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6448246223) 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, 1074707701 + ... + 1074707706.

It is an arithmetic number, because the mean of its divisors is an integer number (2149415408).

Almost surely, 2^6448246221 is an apocalyptic number.

It is an amenable number.

6448246221 is a deficient number, since it is larger than the sum of its proper divisors (2149415411).

6448246221 is a wasteful number, since it uses less digits than its factorization.

6448246221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2149415410.

The product of its digits is 147456, while the sum is 39.

The square root of 6448246221 is about 80300.9727276077. The cubic root of 6448246221 is about 1861.2892573195.

The spelling of 6448246221 in words is "six billion, four hundred forty-eight million, two hundred forty-six thousand, two hundred twenty-one".