8444013021 has 8 divisors (see below), whose sum is σ = 12509648960. Its totient is φ = 5629341996.

The previous prime is 8444012971. The next prime is 8444013037. The reversal of 8444013021 is 1203104448.

It is not a de Polignac number, because 8444013021 - 2⁷ = 8444012893 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27), and also a Moran number because the ratio is a prime number: 312741223 = 8444013021 / (8 + 4 + 4 + 4 + 0 + 1 + 3 + 0 + 2 + 1).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8444013521) 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, 156370585 + ... + 156370638.

It is an arithmetic number, because the mean of its divisors is an integer number (1563706120).

Almost surely, 2^8444013021 is an apocalyptic number.

It is an amenable number.

8444013021 is a deficient number, since it is larger than the sum of its proper divisors (4065635939).

8444013021 is a wasteful number, since it uses less digits than its factorization.

8444013021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 312741232 (or 312741226 counting only the distinct ones).

The product of its (nonzero) digits is 3072, while the sum is 27.

The square root of 8444013021 is about 91891.3109113152. The cubic root of 8444013021 is about 2036.3369016903.

Adding to 8444013021 its reverse (1203104448), we get a palindrome (9647117469).

It can be divided in two parts, 84440 and 13021, that added together give a triangular number (97461 = T₄₄₁).

The spelling of 8444013021 in words is "eight billion, four hundred forty-four million, thirteen thousand, twenty-one".