223100021 has 2 divisors, whose sum is σ = 223100022. Its totient is φ = 223100020.

The previous prime is 223099999. The next prime is 223100041. The reversal of 223100021 is 120001322.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 223054225 + 45796 = 14935^2 + 214^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-223100021 is a prime.

It is a super-3 number, since 3×223100021³ (a number of 26 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 223099975 and 223100011.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (223100041) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 111550010 + 111550011.

It is an arithmetic number, because the mean of its divisors is an integer number (111550011).

Almost surely, 2^223100021 is an apocalyptic number.

It is an amenable number.

223100021 is a deficient number, since it is larger than the sum of its proper divisors (1).

223100021 is an equidigital number, since it uses as much as digits as its factorization.

223100021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 24, while the sum is 11.

The square root of 223100021 is about 14936.5330984134. The cubic root of 223100021 is about 606.5033495831.

Adding to 223100021 its reverse (120001322), we get a palindrome (343101343).

The spelling of 223100021 in words is "two hundred twenty-three million, one hundred thousand, twenty-one".