6444286021 has 2 divisors, whose sum is σ = 6444286022. Its totient is φ = 6444286020.

The previous prime is 6444285997. The next prime is 6444286081. The reversal of 6444286021 is 1206824446.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6004545121 + 439740900 = 77489^2 + 20970^2 .

It is a cyclic number.

It is not a de Polignac number, because 6444286021 - 2⁹ = 6444285509 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6444286081) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3222143010 + 3222143011.

It is an arithmetic number, because the mean of its divisors is an integer number (3222143011).

Almost surely, 2^6444286021 is an apocalyptic number.

It is an amenable number.

6444286021 is a deficient number, since it is larger than the sum of its proper divisors (1).

6444286021 is an equidigital number, since it uses as much as digits as its factorization.

6444286021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 73728, while the sum is 37.

The square root of 6444286021 is about 80276.3104595621. The cubic root of 6444286021 is about 1860.9081414334.

The spelling of 6444286021 in words is "six billion, four hundred forty-four million, two hundred eighty-six thousand, twenty-one".