1003221351221 has 2 divisors, whose sum is σ = 1003221351222. Its totient is φ = 1003221351220.

The previous prime is 1003221351149. The next prime is 1003221351233. The reversal of 1003221351221 is 1221531223001.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 801338280625 + 201883070596 = 895175^2 + 449314^2 .

It is a cyclic number.

It is not a de Polignac number, because 1003221351221 - 2²² = 1003217156917 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1003221351521) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 501610675610 + 501610675611.

It is an arithmetic number, because the mean of its divisors is an integer number (501610675611).

Almost surely, 2^{1003221351221} is an apocalyptic number.

It is an amenable number.

1003221351221 is a deficient number, since it is larger than the sum of its proper divisors (1).

1003221351221 is an equidigital number, since it uses as much as digits as its factorization.

1003221351221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 720, while the sum is 23.

Adding to 1003221351221 its reverse (1221531223001), we get a palindrome (2224752574222).

The spelling of 1003221351221 in words is "one trillion, three billion, two hundred twenty-one million, three hundred fifty-one thousand, two hundred twenty-one".