224011021 has 6 divisors (see below), whose sum is σ = 242568330. Its totient is φ = 206779248.

The previous prime is 224011013. The next prime is 224011033. The reversal of 224011021 is 120110422.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 2418025 + 221592996 = 1555^2 + 14886^2 .

It is not a de Polignac number, because 224011021 - 2³ = 224011013 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (13).

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 224010992 and 224011010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (224017021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 662586 + ... + 662923.

It is an arithmetic number, because the mean of its divisors is an integer number (40428055).

Almost surely, 2^224011021 is an apocalyptic number.

It is an amenable number.

224011021 is a deficient number, since it is larger than the sum of its proper divisors (18557309).

224011021 is a wasteful number, since it uses less digits than its factorization.

224011021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1325535 (or 1325522 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 13.

The square root of 224011021 is about 14966.9977283355. The cubic root of 224011021 is about 607.3277544044.

Adding to 224011021 its reverse (120110422), we get a palindrome (344121443).

The spelling of 224011021 in words is "two hundred twenty-four million, eleven thousand, twenty-one".