415224221 has 4 divisors (see below), whose sum is σ = 433277472. Its totient is φ = 397170972.

The previous prime is 415224197. The next prime is 415224287. The reversal of 415224221 is 122422514.

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 415224221 - 2²² = 411029917 is a prime.

It is a super-2 number, since 2×415224221² = 344822307410113682, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (23), and also a Moran number because the ratio is a prime number: 18053227 = 415224221 / (4 + 1 + 5 + 2 + 2 + 4 + 2 + 2 + 1).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (415224421) 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, 9026591 + ... + 9026636.

It is an arithmetic number, because the mean of its divisors is an integer number (108319368).

Almost surely, 2^415224221 is an apocalyptic number.

It is an amenable number.

415224221 is a deficient number, since it is larger than the sum of its proper divisors (18053251).

415224221 is a wasteful number, since it uses less digits than its factorization.

415224221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18053250.

The product of its digits is 1280, while the sum is 23.

The square root of 415224221 is about 20377.0513323199. The cubic root of 415224221 is about 746.0379035431.

Adding to 415224221 its reverse (122422514), we get a palindrome (537646735).

The spelling of 415224221 in words is "four hundred fifteen million, two hundred twenty-four thousand, two hundred twenty-one".