445040021 has 4 divisors (see below), whose sum is σ = 468463200. Its totient is φ = 421616844.

The previous prime is 445040017. The next prime is 445040023. The reversal of 445040021 is 120040544.

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.

It is a cyclic number.

It is not a de Polignac number, because 445040021 - 2² = 445040017 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 445039975 and 445040002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (445040023) 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, 11711561 + ... + 11711598.

It is an arithmetic number, because the mean of its divisors is an integer number (117115800).

Almost surely, 2^445040021 is an apocalyptic number.

It is an amenable number.

445040021 is a deficient number, since it is larger than the sum of its proper divisors (23423179).

445040021 is a wasteful number, since it uses less digits than its factorization.

445040021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23423178.

The product of its (nonzero) digits is 640, while the sum is 20.

The square root of 445040021 is about 21095.9716770762. The cubic root of 445040021 is about 763.4835586988.

Adding to 445040021 its reverse (120040544), we get a palindrome (565080565).

The spelling of 445040021 in words is "four hundred forty-five million, forty thousand, twenty-one".