224323021 has 16 divisors (see below), whose sum is σ = 246564864. Its totient is φ = 202837824.

The previous prime is 224323019. The next prime is 224323067. The reversal of 224323021 is 120323422.

It is a cyclic number.

It is not a de Polignac number, because 224323021 - 2¹ = 224323019 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 224323021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (224323081) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 136215 + ... + 137851.

It is an arithmetic number, because the mean of its divisors is an integer number (15410304).

Almost surely, 2^224323021 is an apocalyptic number.

It is an amenable number.

224323021 is a deficient number, since it is larger than the sum of its proper divisors (22241843).

224323021 is a wasteful number, since it uses less digits than its factorization.

224323021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1860.

The product of its (nonzero) digits is 576, while the sum is 19.

The square root of 224323021 is about 14977.4170336544. The cubic root of 224323021 is about 607.6095833297.

Adding to 224323021 its reverse (120323422), we get a palindrome (344646443).

The spelling of 224323021 in words is "two hundred twenty-four million, three hundred twenty-three thousand, twenty-one".