224043021 has 6 divisors (see below), whose sum is σ = 323617710. Its totient is φ = 149362008.

The previous prime is 224043007. The next prime is 224043049. The reversal of 224043021 is 120340422.

It can be written as a sum of positive squares in only one way, i.e., 145082025 + 78960996 = 12045^2 + 8886^2 .

It is not a de Polignac number, because 224043021 - 2⁶ = 224042957 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 224042985 and 224043003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (224043121) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 12446826 + ... + 12446843.

It is an arithmetic number, because the mean of its divisors is an integer number (53936285).

Almost surely, 2^224043021 is an apocalyptic number.

It is an amenable number.

224043021 is a deficient number, since it is larger than the sum of its proper divisors (99574689).

224043021 is a wasteful number, since it uses less digits than its factorization.

224043021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24893675 (or 24893672 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 18.

The square root of 224043021 is about 14968.0667088305. The cubic root of 224043021 is about 607.3566719739.

Adding to 224043021 its reverse (120340422), we get a palindrome (344383443).

It can be divided in two parts, 22404 and 3021, that added together give a triangular number (25425 = T₂₂₅).

The spelling of 224043021 in words is "two hundred twenty-four million, forty-three thousand, twenty-one".