420244221 has 4 divisors (see below), whose sum is σ = 560325632. Its totient is φ = 280162812.

The previous prime is 420244217. The next prime is 420244229. The reversal of 420244221 is 122442024.

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 420244221 - 2² = 420244217 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (420244229) 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, 70040701 + ... + 70040706.

It is an arithmetic number, because the mean of its divisors is an integer number (140081408).

Almost surely, 2^420244221 is an apocalyptic number.

It is an amenable number.

420244221 is a deficient number, since it is larger than the sum of its proper divisors (140081411).

420244221 is a wasteful number, since it uses less digits than its factorization.

420244221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 140081410.

The product of its (nonzero) digits is 1024, while the sum is 21.

The square root of 420244221 is about 20499.8590482959. The cubic root of 420244221 is about 749.0323645569.

Adding to 420244221 its reverse (122442024), we get a palindrome (542686245).

The spelling of 420244221 in words is "four hundred twenty million, two hundred forty-four thousand, two hundred twenty-one".