221223200221 has 2 divisors, whose sum is σ = 221223200222. Its totient is φ = 221223200220.

The previous prime is 221223200201. The next prime is 221223200239. The reversal of 221223200221 is 122002322122.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 119723612121 + 101499588100 = 346011^2 + 318590^2 .

It is a cyclic number.

It is not a de Polignac number, because 221223200221 - 2⁹ = 221223199709 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (221223200201) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110611600110 + 110611600111.

It is an arithmetic number, because the mean of its divisors is an integer number (110611600111).

Almost surely, 2^221223200221 is an apocalyptic number.

It is an amenable number.

221223200221 is a deficient number, since it is larger than the sum of its proper divisors (1).

221223200221 is an equidigital number, since it uses as much as digits as its factorization.

221223200221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 384, while the sum is 19.

Adding to 221223200221 its reverse (122002322122), we get a palindrome (343225522343).

The spelling of 221223200221 in words is "two hundred twenty-one billion, two hundred twenty-three million, two hundred thousand, two hundred twenty-one".