1221303101 has 2 divisors, whose sum is σ = 1221303102. Its totient is φ = 1221303100.

The previous prime is 1221303079. The next prime is 1221303119. The reversal of 1221303101 is 1013031221.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1124260900 + 97042201 = 33530^2 + 9851^2 .

It is an emirp because it is prime and its reverse (1013031221) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1221303101 - 2¹⁰ = 1221302077 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1221303191) 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, 610651550 + 610651551.

It is an arithmetic number, because the mean of its divisors is an integer number (610651551).

Almost surely, 2^1221303101 is an apocalyptic number.

It is an amenable number.

1221303101 is a deficient number, since it is larger than the sum of its proper divisors (1).

1221303101 is an equidigital number, since it uses as much as digits as its factorization.

1221303101 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 36, while the sum is 14.

The square root of 1221303101 is about 34947.1472512421. The cubic root of 1221303101 is about 1068.9100325273.

Adding to 1221303101 its reverse (1013031221), we get a palindrome (2234334322).

The spelling of 1221303101 in words is "one billion, two hundred twenty-one million, three hundred three thousand, one hundred one".