223240021 has 8 divisors (see below), whose sum is σ = 231116544. Its totient is φ = 215405760.

The previous prime is 223240019. The next prime is 223240033. The reversal of 223240021 is 120042322.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 223240021 - 2¹ = 223240019 is a prime.

It is a super-3 number, since 3×223240021³ (a number of 26 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 223239977 and 223240004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (223240091) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 381 + ... + 21133.

It is an arithmetic number, because the mean of its divisors is an integer number (28889568).

Almost surely, 2^223240021 is an apocalyptic number.

It is an amenable number.

223240021 is a deficient number, since it is larger than the sum of its proper divisors (7876523).

223240021 is a wasteful number, since it uses less digits than its factorization.

223240021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21131.

The product of its (nonzero) digits is 192, while the sum is 16.

The square root of 223240021 is about 14941.2188592497. The cubic root of 223240021 is about 606.6301876320.

Adding to 223240021 its reverse (120042322), we get a palindrome (343282343).

The spelling of 223240021 in words is "two hundred twenty-three million, two hundred forty thousand, twenty-one".