223210021 has 4 divisors (see below), whose sum is σ = 223324012. Its totient is φ = 223096032.

The previous prime is 223210007. The next prime is 223210063. The reversal of 223210021 is 120012322.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 199092100 + 24117921 = 14110^2 + 4911^2 .

It is a cyclic number.

It is not a de Polignac number, because 223210021 - 2⁷ = 223209893 is a prime.

It is a super-3 number, since 3×223210021³ (a number of 26 digits) contains 333 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 223209983 and 223210010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (223210121) 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, 54006 + ... + 57991.

It is an arithmetic number, because the mean of its divisors is an integer number (55831003).

Almost surely, 2^223210021 is an apocalyptic number.

It is an amenable number.

223210021 is a deficient number, since it is larger than the sum of its proper divisors (113991).

223210021 is a wasteful number, since it uses less digits than its factorization.

223210021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 113990.

The product of its (nonzero) digits is 48, while the sum is 13.

The square root of 223210021 is about 14940.2148913595. The cubic root of 223210021 is about 606.6030125152.

Adding to 223210021 its reverse (120012322), we get a palindrome (343222343).

The spelling of 223210021 in words is "two hundred twenty-three million, two hundred ten thousand, twenty-one".