221003031221321 has 2 divisors, whose sum is σ = 221003031221322. Its totient is φ = 221003031221320.

The previous prime is 221003031221311. The next prime is 221003031221411. The reversal of 221003031221321 is 123122130300122.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 200683347375625 + 20319683845696 = 14166275^2 + 4507736^2 .

It is a cyclic number.

It is not a de Polignac number, because 221003031221321 - 2⁴⁶ = 150634287043657 is a prime.

It is not a weakly prime, because it can be changed into another prime (221003031221311) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110501515610660 + 110501515610661.

It is an arithmetic number, because the mean of its divisors is an integer number (110501515610661).

Almost surely, 2^{221003031221321} is an apocalyptic number.

It is an amenable number.

221003031221321 is a deficient number, since it is larger than the sum of its proper divisors (1).

221003031221321 is an equidigital number, since it uses as much as digits as its factorization.

221003031221321 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 864, while the sum is 23.

Adding to 221003031221321 its reverse (123122130300122), we get a palindrome (344125161521443).

The spelling of 221003031221321 in words is "two hundred twenty-one trillion, three billion, thirty-one million, two hundred twenty-one thousand, three hundred twenty-one".