4205223421 has 4 divisors (see below), whose sum is σ = 4805969632. Its totient is φ = 3604477212.

The previous prime is 4205223397. The next prime is 4205223461. The reversal of 4205223421 is 1243225024.

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 not a de Polignac number, because 4205223421 - 2¹⁵ = 4205190653 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 (4205223461) 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, 300373095 + ... + 300373108.

It is an arithmetic number, because the mean of its divisors is an integer number (1201492408).

Almost surely, 2^4205223421 is an apocalyptic number.

It is an amenable number.

4205223421 is a deficient number, since it is larger than the sum of its proper divisors (600746211).

4205223421 is an equidigital number, since it uses as much as digits as its factorization.

4205223421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 600746210.

The product of its (nonzero) digits is 3840, while the sum is 25.

The square root of 4205223421 is about 64847.6940299345. The cubic root of 4205223421 is about 1614.0972274336.

Adding to 4205223421 its reverse (1243225024), we get a palindrome (5448448445).

The spelling of 4205223421 in words is "four billion, two hundred five million, two hundred twenty-three thousand, four hundred twenty-one".