6446246421 has 4 divisors (see below), whose sum is σ = 8594995232. Its totient is φ = 4297497612.

The previous prime is 6446246407. The next prime is 6446246459. The reversal of 6446246421 is 1246426446.

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 6446246421 - 2⁷ = 6446246293 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 6446246421.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6446246621) 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, 1074374401 + ... + 1074374406.

It is an arithmetic number, because the mean of its divisors is an integer number (2148748808).

Almost surely, 2^6446246421 is an apocalyptic number.

It is an amenable number.

6446246421 is a deficient number, since it is larger than the sum of its proper divisors (2148748811).

6446246421 is a wasteful number, since it uses less digits than its factorization.

6446246421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2148748810.

The product of its digits is 221184, while the sum is 39.

The square root of 6446246421 is about 80288.5198580719. The cubic root of 6446246421 is about 1861.0968230262.

The spelling of 6446246421 in words is "six billion, four hundred forty-six million, two hundred forty-six thousand, four hundred twenty-one".