45444444021 has 24 divisors (see below), whose sum is σ = 65891235800. Its totient is φ = 30181372416.

The previous prime is 45444443983. The next prime is 45444444037. The reversal of 45444444021 is 12044444454.

It can be written as a sum of positive squares in 4 ways, for example, as 171243396 + 45273200625 = 13086^2 + 212775^2 .

It is not a de Polignac number, because 45444444021 - 2¹⁵ = 45444411253 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (45444445021) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 6016155 + ... + 6023703.

Almost surely, 2^45444444021 is an apocalyptic number.

It is an amenable number.

45444444021 is a deficient number, since it is larger than the sum of its proper divisors (20446791779).

45444444021 is a wasteful number, since it uses less digits than its factorization.

45444444021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10005 (or 10002 counting only the distinct ones).

The product of its (nonzero) digits is 163840, while the sum is 36.

Adding to 45444444021 its reverse (12044444454), we get a palindrome (57488888475).

The spelling of 45444444021 in words is "forty-five billion, four hundred forty-four million, four hundred forty-four thousand, twenty-one".