45444021 has 24 divisors (see below), whose sum is σ = 73554624. Its totient is φ = 24837120.

The previous prime is 45444017. The next prime is 45444037. The reversal of 45444021 is 12044454.

It is a happy number.

It is not a de Polignac number, because 45444021 - 2² = 45444017 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 45443982 and 45444000.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (45444011) 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, 3340 + ... + 10101.

It is an arithmetic number, because the mean of its divisors is an integer number (3064776).

Almost surely, 2^45444021 is an apocalyptic number.

It is an amenable number.

45444021 is a deficient number, since it is larger than the sum of its proper divisors (28110603).

45444021 is a wasteful number, since it uses less digits than its factorization.

45444021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13481 (or 13474 counting only the distinct ones).

The product of its (nonzero) digits is 2560, while the sum is 24.

The square root of 45444021 is about 6741.2180650087. The cubic root of 45444021 is about 356.8553816393.

Adding to 45444021 its reverse (12044454), we get a palindrome (57488475).

The spelling of 45444021 in words is "forty-five million, four hundred forty-four thousand, twenty-one".