5644445021 has 4 divisors (see below), whose sum is σ = 5644688832. Its totient is φ = 5644201212.

The previous prime is 5644445017. The next prime is 5644445029. The reversal of 5644445021 is 1205444465.

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, and also an emirpimes, since its reverse is a distinct semiprime: 1205444465 = 5 ⋅241088893.

It is a cyclic number.

It is not a de Polignac number, because 5644445021 - 2² = 5644445017 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (5644445029) 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, 83051 + ... + 134856.

It is an arithmetic number, because the mean of its divisors is an integer number (1411172208).

Almost surely, 2^5644445021 is an apocalyptic number.

It is an amenable number.

5644445021 is a deficient number, since it is larger than the sum of its proper divisors (243811).

5644445021 is a wasteful number, since it uses less digits than its factorization.

5644445021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 243810.

The product of its (nonzero) digits is 76800, while the sum is 35.

The square root of 5644445021 is about 75129.5216343083. The cubic root of 5644445021 is about 1780.4935950704.

Adding to 5644445021 its reverse (1205444465), we get a palindrome (6849889486).

The spelling of 5644445021 in words is "five billion, six hundred forty-four million, four hundred forty-five thousand, twenty-one".