6441073821 has 48 divisors (see below), whose sum is σ = 11474037120. Its totient is φ = 3390595200.

The previous prime is 6441073813. The next prime is 6441073823. The reversal of 6441073821 is 1283701446.

6441073821 is a `hidden beast` number, since 644 + 1 + 0 + 7 + 3 + 8 + 2 + 1 = 666.

It is not a de Polignac number, because 6441073821 - 2³ = 6441073813 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6441073823) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 409146 + ... + 424596.

It is an arithmetic number, because the mean of its divisors is an integer number (239042440).

Almost surely, 2^6441073821 is an apocalyptic number.

It is an amenable number.

6441073821 is a deficient number, since it is larger than the sum of its proper divisors (5032963299).

6441073821 is a wasteful number, since it uses less digits than its factorization.

6441073821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15986 (or 15983 counting only the distinct ones).

The product of its (nonzero) digits is 32256, while the sum is 36.

The square root of 6441073821 is about 80256.3008180666. The cubic root of 6441073821 is about 1860.5988957656.

The spelling of 6441073821 in words is "six billion, four hundred forty-one million, seventy-three thousand, eight hundred twenty-one".