221331203221 has 2 divisors, whose sum is σ = 221331203222. Its totient is φ = 221331203220.

The previous prime is 221331203111. The next prime is 221331203257. The reversal of 221331203221 is 122302133122.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 206924002321 + 14407200900 = 454889^2 + 120030^2 .

It is a cyclic number.

It is not a de Polignac number, because 221331203221 - 2⁹ = 221331202709 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 221331203192 and 221331203201.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (221331209221) 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 as a sum of consecutive naturals, namely, 110665601610 + 110665601611.

It is an arithmetic number, because the mean of its divisors is an integer number (110665601611).

Almost surely, 2^221331203221 is an apocalyptic number.

It is an amenable number.

221331203221 is a deficient number, since it is larger than the sum of its proper divisors (1).

221331203221 is an equidigital number, since it uses as much as digits as its factorization.

221331203221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 864, while the sum is 22.

Adding to 221331203221 its reverse (122302133122), we get a palindrome (343633336343).

The spelling of 221331203221 in words is "two hundred twenty-one billion, three hundred thirty-one million, two hundred three thousand, two hundred twenty-one".