223201021 has 2 divisors, whose sum is σ = 223201022. Its totient is φ = 223201020.

The previous prime is 223201019. The next prime is 223201031. The reversal of 223201021 is 120102322.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 191684025 + 31516996 = 13845^2 + 5614^2 .

It is a cyclic number.

It is not a de Polignac number, because 223201021 - 2¹ = 223201019 is a prime.

It is a super-3 number, since 3×223201021³ (a number of 26 digits) contains 333 as substring.

Together with 223201019, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 223200992 and 223201010.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (223201031) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 111600510 + 111600511.

It is an arithmetic number, because the mean of its divisors is an integer number (111600511).

Almost surely, 2^223201021 is an apocalyptic number.

It is an amenable number.

223201021 is a deficient number, since it is larger than the sum of its proper divisors (1).

223201021 is an equidigital number, since it uses as much as digits as its factorization.

223201021 is an evil number, because the sum of its binary digits is even.

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

The square root of 223201021 is about 14939.9136878364. The cubic root of 223201021 is about 606.5948595054.

Adding to 223201021 its reverse (120102322), we get a palindrome (343303343).

The spelling of 223201021 in words is "two hundred twenty-three million, two hundred one thousand, twenty-one".