445204421 has 4 divisors (see below), whose sum is σ = 450840000. Its totient is φ = 439568844.

The previous prime is 445204411. The next prime is 445204427. The reversal of 445204421 is 124402544.

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 a de Polignac number, because none of the positive numbers 2^k-445204421 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 (445204427) 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, 2817671 + ... + 2817828.

It is an arithmetic number, because the mean of its divisors is an integer number (112710000).

Almost surely, 2^445204421 is an apocalyptic number.

It is an amenable number.

445204421 is a deficient number, since it is larger than the sum of its proper divisors (5635579).

445204421 is an equidigital number, since it uses as much as digits as its factorization.

445204421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5635578.

The product of its (nonzero) digits is 5120, while the sum is 26.

The square root of 445204421 is about 21099.8677957944. The cubic root of 445204421 is about 763.5775586679.

Adding to 445204421 its reverse (124402544), we get a palindrome (569606965).

The spelling of 445204421 in words is "four hundred forty-five million, two hundred four thousand, four hundred twenty-one".