224521421 has 4 divisors (see below), whose sum is σ = 224551872. Its totient is φ = 224490972.

The previous prime is 224521399. The next prime is 224521433. The reversal of 224521421 is 124125422.

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, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 224521421 - 2²⁶ = 157412557 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 (224521471) 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, 3566 + ... + 21488.

It is an arithmetic number, because the mean of its divisors is an integer number (56137968).

Almost surely, 2^224521421 is an apocalyptic number.

It is an amenable number.

224521421 is a deficient number, since it is larger than the sum of its proper divisors (30451).

224521421 is a wasteful number, since it uses less digits than its factorization.

224521421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30450.

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

The square root of 224521421 is about 14984.0388747494. The cubic root of 224521421 is about 607.7886617239.

Adding to 224521421 its reverse (124125422), we get a palindrome (348646843).

The spelling of 224521421 in words is "two hundred twenty-four million, five hundred twenty-one thousand, four hundred twenty-one".