445425021 has 16 divisors (see below), whose sum is σ = 664931520. Its totient is φ = 294680880.

The previous prime is 445425011. The next prime is 445425053. The reversal of 445425021 is 120524544.

It is not a de Polignac number, because 445425021 - 2¹⁴ = 445408637 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (445425011) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 59430 + ... + 66503.

It is an arithmetic number, because the mean of its divisors is an integer number (41558220).

Almost surely, 2^445425021 is an apocalyptic number.

It is an amenable number.

445425021 is a deficient number, since it is larger than the sum of its proper divisors (219506499).

445425021 is a wasteful number, since it uses less digits than its factorization.

445425021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 126073 (or 126067 counting only the distinct ones).

The product of its (nonzero) digits is 6400, while the sum is 27.

The square root of 445425021 is about 21105.0946692973. The cubic root of 445425021 is about 763.7036560945.

Adding to 445425021 its reverse (120524544), we get a palindrome (565949565).

The spelling of 445425021 in words is "four hundred forty-five million, four hundred twenty-five thousand, twenty-one".